You may be onto something there. I hadn't considered that Tom may not have known of Luca's assignment. I couldn't imagine that Tom, no matter how much stress he was under, would reveal something that would sign Luca's death certificate.

But if he didn't know, it makes sense.

The theory that only Vito knew about Luca's assignment is bolstered by the confusion among the sons and the capos about his whereabouts after the shooting.

"A man in my position cannot afford to be made to look ridiculous!"