Maul is really going all out against the clones. It's almost as if his Forcehas beenunleashed?
Maul has no problem fighting clones while Ahsoka has some difficulties even if she has two lightsabers. Is it because 501st legion knows her fighting style? Is it because Maul fought clones before? Maybe Ahsoka doesn't want to fight them? Or maybe as mentioned Dark Side of the Force has never been stronger? Or maybe all of above?
The clones are Ahsoka's friends and comrades-in-arms, and she knows that they're under the control of their inhibitor chips. Even though they're trying to kill her, she can't bring herself to harm them. Maul, however, has no problem with killing as many clones as he can, so he can go all-out.
The medical bay scanners are unable to locate Rex's inhibitor chip until Ahsoka taps in with the Force to find it. The Kaminoan cloners wouldn't have wanted the Republic knowing about the chips or Protocol 66 before the time to use them, so the chips would naturally have been made to evade Republic scanners.
Ahsoka is uniquely qualified to survive Order 66. After all, this is the thirdtime she's had clone troopers turn on her and try to kill or capture her, so she knows how to counter and evade them(and as we later find out, has trained extensively under these very conditions). Also, her newfound detachment from the Jedi way lets her consider options no Jedi would, like freeing Maul so he can serve as a convenient distraction.
Conversely, Jedi like Obi-Wan Kenobi, Kanan Jarrus, and Cal Kestis only survive the initial stages through sheer dumb luck and heroic sacrifices. Kanan and Cal lose their masters and Boga deliberately took the cannon round meant for Obi-Wan. Kanan is also allowed to initially escape by Clone Force 99, as the inhibitor chips didn't work properly with most of them. Yoda is the only actual Jedi who survives the initial attack on his own merits because he's well, Yoda.
Though that's not to say Luck didn't play a role in things- Fives happened to be in the same squad as Tup, who had a defective chip, which led him to investigate, and Fives' death happened to make Rex want to investigate the Chips on his own, which allowed him to happen to have the will to overpower the chips and give Ahsoka a clue on how to survive. The Force works in mysterious ways...
Maul likely lost his lightsaber on Mandalore when he fell, which explains why he doesn't simply reclaim it from wherever it was stashed and then go to town on the clones.
Similarly, Ahsoka refuses to hand over a lightsaber for reasons other than lack of trust. Her lightsabers are Jedi weapons, given that Maul is a Sith, the concept of him wielding a saber meant for a champion of the light doesn't sit well with her.
If you consider May 1st, the episode's release date, as the new date of Order 66/Empire Day (as opposed to May 15th, the release date of Revenge of the Sith), this also means Ezra's birthday is on May 1st. Luke and Leia were born a couple of days later... which could very well be May 4th; Star Wars Day.
The title "Shattered" doesn't just refer to Ahsoka's world being turned upside when Order 66 is executed, but also the audience's expectation for Captain Rex. Previous canonical stories and tie-materials implied that Captain Rex removed his biochip before Order 66 came and immediately protected Ahsoka when the clones turned against her. Fans were expecting Rex to defy Palpatine's order... only to be shocked when Rex not only complies but responds to Palpatine with something that he wouldn't know beforehand: "Yes, Lord Sidious."
The reasoning for this could also be this. How likely would it have been for Rex to let his brothers be turned into mindless drones if he had known beforehand?
Rex mentions that without Clone Wars, he and his brothers wouldn't exist. It might have subtext in reality. Without Prequel Trilogy bashed by many fans and critics, there wouldn't be characters like Rex enjoyed by so many. Even media with bad reputation might lead to something greater. So the fridge lesson here might be: Do not reject failures of the past, even the Star Wars canon, for they still have things to teach us.
Ahsoka had no idea that the two clones behind her raised their blasters at her until Rex exclaimed, "No! I'll do it." This way, Ahsoka was alerted that there was something wrong with the other clones and that they were all about to attack her, preventing her from dying the same way Aayla did (i.e. being surrounded and shot from behind without her realizing it).
We get to see first hand how Rex was victimized by the control chip in his head. He's fully conscious and aware of what he's doing, he just has no choice in it. Only his deep friendship with Ahsoka and sheer willpower prevents him from simply becoming a mindless drone hellbent on killing her the instant the order goes out, and even then it only lasts for a few seconds before he's completely subservient to Sidious. Now, imagine this happening to every other clone in the Republic army.
The look on Rex's face as he fires his blasters at Ahsoka in the briefing room. There's no anger, no sadness, not even confusion. Just a soldier firing at a target, nothing more.
In Rebels, Rex told Kanan he didn't betray his Jedi, and he removed his chip. This was interpreted to mean he removed his chip before he could turn on the Jedi, but the above happened. If Kanan had found out the real truth while he was still alive, Kanan would never trust or forgive Rex. It's not like Ahsoka would ever tell Kanan that.
It also adds another layer to exactly why Wolffe immediately opened fire on Kanan and company when they showed up. He's no doubt developed a severe fear of Jedi because of what he was forced to do, but unlike Rex, he lacks the support base and strength of character to accept it wasn't his fault.
The red-armored clone troopers that escort Maul onto the ship are not from the 501st Legion, but the Coruscant Shock Trooper division, which in Revenge of the Sith answers directly to Palpatine. Clearly, they were there to bring Maul directly to the Sith Lord once they reached Coruscant. No wonder Maul was ready to kill himself in the previous episode, considering what happened the last time he was at Palpatine's "mercy".
If Ahsoka and Maul were able to hear Anakin falling to the Dark Side and Palpatine killing Mace, then that likely means that Yoda, Jaro Tapal, and every other Jedi who felt a disturbance in the Force at that time and reacted badly heard the exact same thing.
Not necessarily, considering Ahsoka was Anakin's apprentice and Maul was Palpatine's. Maul was also already aware the Endgame was coming very soon, and was likely already sensitive to events regarding it, or was actively feeling for it (not like he had anything else to do at the moment).
We already saw Yoda sensing something awful right before Order 66 in Revenge of the Sith. Maybe he, at least, did hear the duel. It also helps that he didn't seem all that surprised about Anakin's fall. However, there could be a few other explanations for this, such as a) it being Yoda, one of the most powerful Jedi alive, and just sensitive to this sort of thing, b) More specifically, Yoda sensing several powerful masters being snuffed out in rapid succession and the Chosen One's turbulence in the Force, and/or c) He was warned something bad like this could happen in an earlier arc of Clone Wars and was ready.
While Ahsoka and Rex will be trying their damnedest to escape, one cannot forget that they had left that Mandalorian holding cell. Who knows what Sidious would do with it when he gets his hands on it.
It was likely destroyed when the Venator crashed in the following episode.
Sidious has his own methods for dealing with Jedi. He's more a monster than generations of Mandalorians could hope for. He doesn't need a holding cell.
