--Clemenza was the one who brought Neri to Michael's attention. And, as it turned out, Neri, not Rocco, was Michael's man.
Didn't the two just have different positions in the organisation? We learn that Rocco built a secret regime, smoething that only Vito and Michael knew about.
So, just as Neri is Michael's Luca, Rocco is Michael's Clemenza.
It seemed to me that:
--Clemenza spotted Neri as a promising recruit, and Michael and Vito vetted him;
--Clemenza undertook Neri's training;
--After Clemenza was satisfied with Neri, he seemed to function as Michael's bodyguard.
But I think he became Michael's "Luca Brasi" after he whacked Moe Green, thus "doing a job of murder all by himself."
I don't recall any personal interactions between Michael and Rocco.
