One thing I found interesting about the young Clemenza, is that he would freely shout and holler at Vito when he didn't agree with him. But after Vito killed Ciccio...Clemenza never did again...which I think is indicative of Clemenza's overall loyalty and admiration of Vito, which would be proved by him never selling out

Sonny - Well then, business will have to suffer, all right? And listen, do me a favor, Tom. No more advice on how to patch things up, just help me win, please