It would take something like 6 months to get fatty back to shape. Probably another six to be average high school soccer player stamina/strength even if he was high level not that long ago. A full year is a lot of time, I guess they'll show us how useful he can be even just leveling up and how he'll make it just in time.
Or someone else will prove being at least as good, if not better than he is, might be the new midget, Araki being his manager to bring him to incredible levels.