Roth's interest to keep the finger pointing at Pentangeli spectacularly failed
As we debated in Did Roth sort of win? thread: True Woltz let's not overstate the impact he had on Michael and luck had little or nothing to do with it

Michael was expected to be dead, machine gunned in his bedroom
I reckon noone would have suspected Roth and his "New York connection." wouldn't have mattered but he overthought it which ended up pointing the finger at him, when Michael survived

How would he know Rocco would say looks like they were hired out of New York unless that was their plan
Then was Rocco the second traitor and the one who killed the two assassins?

Then why couldn't Rocco carry out the shooting himself?
Just the one assassin not three No doubt less risky less complicated