JML is like crap relationship (sorry for that metaphore at the moment). On good days, he is really good and does not feel good idea to let him go. But results show, that you can not relay on him. If you ask - bring it home, as fast as you can but priority - bring it home, then speed drops a lot. Which means he drives over his limits and that's why all the mistakes and crashes. A lot of bad luck / technical problems haven't been helping him also.