Simply for the fact that by the end of the game, fire is the worst element. I think his melee will be iffy as well. After playing as melee Zero for so long, not having Deception is a way to a quick melee-based death. Also not having backstab.
"Learn the lesson that George Lucas fails to learn: despite the fact that you created this series, it doesn't belong in your hands." Langis on Sonic
They're not going to make a character that can't succeed. All 5 of the characters right now can dominate in their own different ways, if used correctly....and I don't see that changing just because the new guy uses fire.
I'm pretty sure I'll still be able to shoot loaders with my Hornet. ;)
Would you like to do battle with a Brony riding piggyback on a Rabid Stalker? If the answer is no, you are sad, and I've no desire to speak with you further.