Because there's no doubt about about how many points either one has. Thats never been up for discussion. It's difficult to even make the argument that Schumacher could have had a lot more points but for problems. Most of his incidents have been of his own doing. It's not like he had a sure podium somewhere but then had a puncture.
The issue that's been confounding people all year is why he's missing those final crucial tenths of a second. Whether it's practice, qualifying, or the race.
Well, there were all those foolish strategy decisions during a few races at the beginning of the season. But that really wouldn't change things much.