Dammit you got me again... you are so good at this!
I'm curious though, how do you define clearing out a division? Is that when you are literally the only fighter in that division? Do you actually have to kill the other fighters? If holding the belt for 7 years and having only one of your fights actually look challenging isn't clearing out a division, then I don't know what is...
There, I kept it short and simple for you.
In my opinion, as long as other fighters are still putting together win streaks, you can't clear out a division.