I think there has been more than just one factor that has led to Schumacher's past successes. He definitely has the talent. But then again, he's also been luckier than most. For me, JV and Schumi were arguably the most talented drivers on track, but their careers headed in opposite directions, with luck being hte determining factor.
Neway as for JPM, he definitely seems like the only guy along with Kimi who looks likely to take the title away from MS. I dont think the pressure ever gets to him, infact i think he has a big game temperament, and fights to the finish. Kimi is the iceman, much like Mika used to be, but maybe showing a little more aggresion could help his cause.
My pick wud be the BMW Williams. And Juan Pablo Montoya.