First off, he's had a bit of luck with that nelson decision, and almost getting finished vs Browne.
He also weighs more than the 265 pound limit, which means he can have 20-40 pounds on his opponent come fight night. That has to be taken into consideration. I don't think anybody in their right mind would argue he is the more skilled fighter between himself and Browne.
If somebody with his skill set, or lack there of, can go on such a streak, it makes the division look terrible, that's why I've always argued that 235-245 maximum should be the limit at heavyweight.