You have a point,but i dont think Nomura would throw in flashback clips like that,it would throw everybody off. And if it were a flashback,of all Keyblades hed probably show Xehanort Aquas Keyblade,since thats the one that was in his possession. Im guessing its the "New" Xehanort and "New" Braig, im not sure how Braig got ahold on MX's Keyblade,but were going to have to find out.
CORRECTION! Braig didnt find MX's keyblade, MX summoned it. Also i believe when he summoned it he didnt wear gloves,so he maybe somehow in his Terranort state.