I think it could be Lana's Tongue-in Cheek!

We'd had some entertaining debates recently regarding Roth's hits and misses in threads
1. Pentangeli Meeting with Rosarto Brothers
2. Why the Tahoe assassins?

I reckon as soon as Roth learned that Pentangeli is a dead man, set up a meeting with the Rosato brothers -- says he's gonna go for their deal, he would have figured, Michael knew Pentangeli was not behind the shooting

As we'd discussed, Michael's killing in Havana is fraught with problems as to why he was the only one

They still had Corleone people like Neri, Rocco, their own men and means Hence there was plenty they could do, to take revenge