Showing up for the funeral still doesn't change the fact that Gotti, ange, and the whole crew felt like Paul was gonna whack them imo
That is the main and maybe only reason for Gotti killing Castellano. If not for wanting to protect Ruggerio, Gotti may have been content to stay a captain.
i think gotti always wanted to be the boss or he may have been placated if he was named underboss. Supposedly Paul had floated around the idea if he went to jail of a three man ruling panel consisting of gotti tommy gambini and bilotti but john hated that idea
