The way I imagine it, Sato will probably be weak damage-wise (compared to the others) but he'll have a plethora of status-affecting skills, like buffs, debuffs, maybe me patra and similar, ailments, etc. Probably will focus on debuffs/ailments, and for actual damage his physical attacks (probably single-targeting physicals) will be better than his Garu line.

[s]sato and kato should totally have a combination attack[/s]