Only time will tell. Maybe he was struggling with command or something that we don't know about. Maybe he had butterflies, maybe he felt he was getting squeezed by the umps early on. He might need a few games to get going. Hell, he might just suck and get lucky sometimes. The only way we will know is if he can put together a string of wins and show that he knows what he is doing.
I personally like Jon and think that he is will need to put it together to help us make a run. Hopefully he has found his touch a little and can put together some nice starts for us. He really needs to pitch well and forget everything else.