The only thing that stops this is Dana or Lorenzo stepping in and telling BJ to drop it. Penn ranted and raved for God knows how long about his intentions to move up to 185 and take on Silva until Dana stated flat-out "I don't care how much B.J Penn bitches and whines, I'm not making this fight" and BJ has not said word one since then. I think the relationship between Dana and BJ is enough that if Dana, even as a personal favor asked him to stop he would.