The difference is that JBJ already had a full camp. It would be stupid for Machida to accept his last chance at the title without training when he is already guaranteed the fight. If JBJ loses he would get a rematch right away. I wouldn't say the last occasion was the same as Jones either. In both cases he wasn't scheduled in the first place anyway.
I kind of feel bad for JBJ....he clearly wants to be liked and he is getting terrible advice from his camp. Is there no other alternative that could of helped JBJ avoid this PR
disaster? This is all about people telling him he has to maintain this perfect record (DQ aside) so he can keep getting the big payday. For his sake I hope he doesn't go on a losing streak at any point because if that happens these people he is trusting to make his decisions will move on to the next big thing just like they did with Evans.