--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.
