No one has mentioned how Elizabeth has stated that Sho has shown her that the power of solitude can be equally as powerful as the power of friendship she witnessed in P4A.
Bad Guy™: Muhaha! Tremble before my mighty powers, puny mortals.
Yu: It's no good... I can't do it... Sorry guys.
Everyone: YU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Mitsuru: Is there no hope... for the future?
???: Hmph, giving up already?
Everyone: HUH?!?
Yu: Sho?!?
Sho: Miss me? I thought you were better than that katana-boy.
Bad Guy™: You're still alive? Whatever. It is of no importance. You won't change the outcome. Not one bit.
Sho: We'll see about that! (You play as Sho here btw, and bring the boss down to 40% life)
Bad Guy™: It's just as I thought. You puny humans cannot hope to stop me. This is the end.
Sho: I hate to say it, but he's right. He's way too strong for me.
Yu: I have an idea. What if we...
Sho: ...Combined our powers? Yeah, that just might work.
(Cutscene where Yu and Sho defeat the boss)
Everyone: We saved the world!
Yu: Wait, Sho! Where are you going?
Sho: Like I said earlier; you live by your own way, I live by my own way.
Yu: Sho... You taught me something. Isolation makes you powerful... but so does Companionship! There's no reason to completely reject the bonds of others!
Sho: Walking a path between Isolation and Companionship huh... Yeah, that sounds interesting.
(Sho walks off into the sunset.)
THE END