I was wondering if it was Danny who set fire to Johnny's house, and yes this would split Jake and Danny up. But Johnny told Ruby that the people who were responsible had paid, Very painfully and I can't really see Johnny letting Danny still hang around if he did unless of course it was because of Jake. For some reason Johnny felt he owes Jake and it would of had to be because of something VERY VERY BIG. There again I can't really see Johnny letting something like this go..unless this is what he meant by painfully paying..Johnny knows it was Danny but Danny doesn't know that he knows...