In fact for him he made the best move by killing Paul. 5 years at the top. And he only had another 20. Whats the alternative, shelved, killed? A nobody. Instead he got the reigns, his son, his brother.
So all in all, popping Paul worked out pretty well, considering.
MORGAN: Why didn't you fight him at the park if you wanted to? I'm not goin' now, I'm eatin' my snack. CHUCKIE: Morgan, Let's go. MORGAN: I'm serious Chuckie, I ain't goin'. WILL: So don't go.