@Cupp didn't they say that he's basically on permanent Adolla Link right now because of how close the two worlds are to merging? Besides that same situation effecting all the flame-users?
@cupp it was said in literally the previous chapter that with the cataclysm so close that shinra (and other pyrokinetics) have their abilities amped which is why hes able to move at lightspeed at will.
I've only been half-assed reading for the past 50 chapters because I missed 20 chapters and never bothered to go back and reread, and even I know what's going on.