This was posted in the thread about Carlo and it spawned another thought. I know that in the novel the murder of McCluskey and Solozzo is pinned on the Bocchicchio clan member, but the Bocchicchio's are ignored completely in the morning aside from the line Clemenza gives about the hostage playing pinochle with his men.

My theory is predicated on the Commission simply using that as a means to an end. That is, it's no secret to the Barzinis, Tattaglias, Straccis and Cuneos that Michael was indeed the perpurtrator of the murders, but merely that after the years of bloodshed, if clearing Michael meant the peace then they would go along with it.

If all of this is true, then how does Barzini account from that when he underestimates Michael in the future? Unless, they believe that Michael was merely the trigger-man and that the operation to kill Solozzo and McCluskey was planned by Sonny and the capos.