I understand what you're saying but the other families wouldn't go to war just because a underboss killed their boss. In real life what would've happened is Butch would've polled the other bosses or the bosses would've accepted it.You right that could be true as well. But if Tony lives and it gets out butchie gave him the greenlight. What do you think happens? Butchie is as good as dead. The other families will kill him because they wouldn’t want their underlyings getting any ideas. Even though they don’t give one personal fukk about Phil. Butchie only play would be to kill Tony as soon as Phil gets wacked and blame it on the war.
In real life John Gotti killed Paul Castellano "without permission" and yes the Genovese's went after him and tried to kill him twice then dropped it.