Here are my complete thoughts on the ending.
[spoilers] It's the Gurren Lagann ending. I didn't like that ending at all and I think it should have ended when Simon had beaten the Spiral King. Here, it's alleviated by the fact that I had guessed prior that Ashi wouldn't make it to the end of the series, but I'm not going to act like it's the perfect ending, given the similarities.
The more I think about it, the more it dissatisfies me. The fact of the matter is that they should have killed off Ashi long before the final showdown with Aku, and the pain it causes Jack should have played into the final blow against Aku. They should have also tied Jack's return to the past with Aku or, better yet, have Jack discover another time portal. Time travel is the worst possible story element to work with, and it sucks that Genndy couldn't do a better job with it, given how good of a story writer he is. If Ashi never existed, yet the original Jack was still sent to the future, then there's no way that he could return to the past, given that Ashi didn't exist, so she couldn't inherit Aku's powers and open a time portal. That means Jack would still be stuck in the future. Again, time travel is hard to write with, because you run into confusing loving paradoxes like this all the time. I'm confusing myself with the logistics of it already.
It's not hard at all to see the positive, though. The amount of callbacks was insane, and it really helped to tie everything Jack has done for the people together into one defining moment where they all return the favor. It was interesting to see Aku utilize an old technique, too; when the supporting cast was getting too close, he created tiny little versions of himself who fought like regular humans, which is exactly what he did against Jack's father during their battle. It was absolutely heartwarming to see the lengths these regular people would go to in order to defeat Aku, even though they probably knew they couldn't actually do stuff against him, and that made it all the more heartbreaking when Aku's rainstorm attack killed the robot people (ON CAMERA TOO). There was no shortage of feels whatsoever.
The Scotsman was on loving point, as always. The interaction between Jack was killer and I was surprised to see his bagpipe become a weapon, seeing as how it was just a gag in the earlier seasons, sometimes becoming a tool. I have no idea about the way he and his daughters rolled into battle though. Is that actually real Celtic lore with the deer and the floating? IDK, still cool.
The piece de resistance is the final blow against Aku. Granted, Jack has split Aku in half before and he's survived it just fine, but this time Jack came prepared. The way the killing strike was shot is so reminiscent of the first couple of episodes of the entire series that it hurts. It's the best way to tie up the entire conflict, in my opinion. The slow-mo was also necessary as forget. [/spoilers]
So basically, yeah. 8/10. Good stuff, could use some tweaking.
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