There could not be any question as far as the potentiallity matters as a player with Gatuso. He was a great defender of all time and has greater contribution to Italian football....
But as a coach ? I think he will need a lot of time to proof his skills. Initial days may end with the struggle for sure... Also his experience as a coach is less compared to other in club level football.

Still best wishes to Napoli for their newer talented coach !!!