no, there was a big twist.
the good brother, knew that the bad brother had to visit the italian mobsters and pay his due (getting the **** kicked out of him, and probably beaten to death), and his brother sean is on his deathbed in the hospital.
so, the good brother calls the cops and rats out jimmy (bad brother) about the truck theft, knowing that they'll arrest him and jail him and put him in rehab. this move would also save jimmy's life, as if he's in jail - he's protected from the italian mob.
but, by putting jimmy in jail, tommy then became the irish mob leader, by default.
and then they cut to jimmy (bad brother) as he was going to jail, and they said "this was the day that changed both their lives", as jimmy decides that sean's likley death and his arrest aren't worth it, and jimmy vows to become good -- then tommy, who has lost one brother to jail and one brother to death, both at the hands of the italians, vows to avenge this and he becomes the bad one, and the new and unlikley mob boss.
and i think sean may die. maybe not. it seems like he's going to though, but may do a big recovery as a plot twist.
i am so vain. and yet, so masochistic. how can the two coexist?