We can only judge greatness by how he performs on the pitch and he performs better than anyone. I don't even think about him being on another club because he isn't.
you might want to think about him being on another club because he is...other than Barca he plays for his country(argentina)....and if you don't know, they have not done a thing w/him at the helm since Maradona's bs in '86....he still has another 3 years to prove to me he has a knack for the back of the onion sack the way Batistuta had for los albicelestes....as for his role at Barca, yes, he is aces...but i want to see him do something radical next summer...especially, since it is being played on his own continent...cheers