Look closely at Terra's and Aqua's summoned weaopns! They have keychains! How is this possible? My theory is that near the ending the three gain the keychains in order to power up the keyblades and to use them at full potential.....woah big words Anyways check it out:

 

http://heartstation.org/gallery/birth-by-sleep/birth-by-sleep-screenshots/cN1XodGEgA55KGQKUXTH4ehgc6l5CRL5.jpg.php

well, since they're wearing the armor that they wear at the end of KH2, ur theory may still be there. idk.

Hmm, not sure what you're implying, but thank you for posting the pic (:

I've never seen this pic before

i don't know maybe but i'm not sure

but its only for co-op mode...

or im wrong ?