Weak starting post but wth, I'll respond. HW is weakest, welterweight is deepest.
What other division is there where unranked person has win over the current champion. (Rick Story vs Johnny Hendricks). Consider that Kos and Pierce almost stole a win as well. Guys who are fringe top ten like Matt Brown, Hyun Kim, and Tarec Saffeidine are capable of defeating the top 5 ers any night of the week.
That could just as easily be an indication of it being a weak division.