Plus if you are ignoring mechanical issues he would of finished about 8th in Valencia instead of 3rd. I am sure there are a few more of those as well in other races.
You didn't take into account that Michael finishing in those positions would have cost Rosberg points, but that and the Valencia thing Masanari pointed out show that any attempt at precision based on "what ifs" is pointless. All we can say is that Schumacher would have been having a competitive season, even more so without silly mistakes like the one in Spain (although this is of course his fault). The rest any analysis on how well he is driving probably depends on your opinion of Rosberg.
2 threads now on the same topic. We should just get a Michael/Lewis - hate/appreciation thread going so all the nonsense can go in there.