Why hasnt Dana White signed erbean for the UFC?

The mans a beast and although his record might be a little shaky you have to admit when he lets those hands lose you better hit the bomb shelter cause its Dresden time. I get a lot of stick for this but I put him in the top 10 mma heavyweights around at the moment. Looking for feedback I mean when the man is on form he's just amazing to watch his uppercut and cross combo are the best package I've seen in either boxing or mma. Go erbean