I think the third question is how would Sollozzo had dealt with Luca, had the Don not tipped his hand and sent Luca into the lion's den so to speak.
So the Don is shot and we have an enraged Luca going on his roaring rampage of revenge...
I think that one way or the other just as Sollozzo and/or Barzini had already penetrated the Don's security, Sollozzo would have already devised a plan for dealing with Luca. The fact that Luca came to see him just made things easier for him.
But they would have removed Luca from the board by hook or by crook before they made their move on Vito.
"When the snows fall and the white winds blow, the lone wolf dies but the pack survives." Winter is Coming Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die. As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.
