If he turns out to be as effective as Toure and Gerrard were for City and Liverpool, then hell yes!
We've been dying for a player like that since Keane.
I don't think either player was comparable to Keane. They are attacking midfielders, where as Keano was the epitome of a box to box midfielder.
Yes, a Toure in prime form would be good (not my taste; still good). Though, Pogba has some distance to cover to reach that level.