Here's some Fridge Brilliance for you: This comic? Axel's not being an asshole and making a Too Soon joke this time. Because he's traveling through time, he doesn't know about the tsunami yet. Duke's still making the Too Soon joke, but Axel isn't.
In Season 2, Axel reached "reverse Nirvana" and obtained the ability to shoot people with "mind bullets" because his soul became so filled with evil and chaos. During Season 6, someone suggested he shoot the Werepires with his mind bullets and he couldn't do it anymore. What happened between Seasons 2 and 6? He fell (genuinely) in love with and got married to Aerith.