[quote=@FacePunch]
If he IS Sunfire, shouldn't he survive he explosion? Maybe he was doused in some nearby chemicals while also on fire? ;)
[/quote]

Well I was for another RP considering having Hiro and Tadashi in it with Tadashi surviving because of chemicals in the showroom.  But I was going between Sunfire and size manipulation powers he couldn't quite control after seeing some fan art of the idea on tumblr.  It's a bit out of left field but I figured it would mean Tadashi would almost need to be recruited into the team as a means to figure out how to control his powers.  With Hiro basically begging to also join so he wouldn't lose his older brother again.  Modifying his suit for flight and controlling the nanobots on his own with better security so no one else would abuse them again.  Since I didn't imagine Tadashi would be cool with Baymax being used for combat.