Trying to figure out how big bahamut actually is and some things don't make much sense.

You see his wing in turn 1, and you're fighting inside the palm of his hand in turn 5 (which is what looks like several miles deeper than turn 1), but his head is only a little bit bigger than a player, and his hands don't look THAT much bigger than him...

Bahamut:


His head:


His hand (yes, this entire area is the palm of his hand)