NOTE: This Wild Mass Guessing contains Epileptic Trees that may spoil the intense storyline of Shinkenger. Visit this particular grove at your own risk!
Assuming the second option: a defeated Ayakashi's spirit returns to the Sanzu River and possesses a Nanashi and eventually restores themself, but this takes a long time. So the gap between attacks are caused by the Gedoushuu waiting for enough Nanashi to turn into Ayakashi.
While there is no show Canon or Word of God to this effect, fan speculation that all the current Samurai-tachi's parents served under the prior Shinken Red leads to some interesting thoughts. Besides Takeru's father dying, the flashback in episode 12 suggests:
- Kotoha's mother took a sword blow across the stomach. This adds a whole new layer to her older sister's concern when Kotoha took on the mantle of Shinken Yellow— if they grew up knowing that mom took that kind of blow, then it would make the danger of being a samurai very real to them.
- Mako's mother being a paraplegic is consistent with the sword blow across the upper back she took. Act 38 makes the effect this has on Mako's life clear, though it is hinted at in act 13.
- Chaiki's father, who we see taking a Renku's own sword to it and its other nameless fellows, was knocked prone and stabbed in the side or abdomen. His expressed desire for Chaiki to be a happy child, who choose to be a samurai rather than being forced, may be a touch of Post Traumatic Stress— or simply the wisdom of a man who got off light in such a deadly situation, compared to his Lord dying and Mako's mother. (Seriously, you normally can't get much worse than a stomach wound!) And:
- Ryunosuke's father, who apparently took Three. Flaming. Arrows. To his chest. This puts his father's command in Act 1 to do well in their performance that day in a whole new light — his comment "It may be the last" could be born of the experience of being injured in the raid. It also gives plenty of motivation to be as stern a samurai master as a kabuki master to Ryu-san.
- The effect of the raid on Kaoru, our hidden true clan head, is less certain, given how little we know so far— but it may have motivated the Shiba to put her in hiding in the first place. What is known is that her mother was possibly pregnant with her during or after the raid. Also, her reference to her father while attempting the seal suggests that, at the least, she hopes her father's sacrifice was not in vain.
- How else are they going to pull off a team-up with the Goseiger?
- Jossed. Shitari returned, but Buredoran, Goseiger's Big Bad, had Dokoku's powers.
- But the clan symbol is too different!
- They obviously changed it when they moved to the living world.
- Very funny. Jossed. Super Sentai and Bleach have absolutely nothing to do with each other although Bleach did some Super Sentai parody.
- The Shiba were originally ronin who gained status after being able to defeat the Gedoushu. The Ikenami were other ronin or mercenaries who fought alonside the Shiba. The Shiraishi were geishas or courtesans. The Tani were thieves or vigilantes of some kind. The Hanaori were ninjas. And, yes, the Umemori only just became samurai with Genta, but his anscestor was likely making tasty helpings, if not serving up sushi.
- Not confirmed but good theory.
- Not confirmed but it is shown that even their mecha got trapped in the dream. Good theory at best.
- Jossed. Akibaranger was not even made at that time.
- YMMV on both sides and Dokoku did protect Dayu so semi-confirmed at best.
- Not jossed but not confirmed either. Let's just leave it at that.