REGISTER TO REMOVE ADS
I'm not sure why Sora's health is so much more in the Demyx scan. Perhaps there's a reaction command during the fight that gives Sora a temporary boost to his own health if you perform the command at the correct time? I also noticed Donald isn't in the scan (notice the party members... it's only Goofy), and I can't tell if Sora is in Wisdom Form or not. Perhaps Donald is absorbed for more health...? No idea... and I can't read Japanese even if the answer is on the page
Sora is in Wisdom Form (the drive gauge is white) So there's a BIG possibility that wisdom form increases your health, just like WF making your keyblade longer.