Summons still replace your party members in KH3. Even though (for some weird reason) your party's health & magic bars are still visible during the summon's session, they clearly disappear when you initiate the summon, and seemingly appear out of nowhere when the summon leaves.
Oh my god, I feel so stupid! When I did both summons, I was so focused on the summons themselves that I just assumed the party was still present, considering the health bar thing.
I would also like to point out a flaw Raxaimus didn't mention. Apparently Sora can still get hit and take damage during the flashy summon finisher?
Thank you for pointing that out! I thought I was missing something about finishers. I'll go ahead and edit the article accordingly!
Once again Raxaimus, THANK YOU for being awesome!
No, YOU'RE awesome!