Mousasi is a great addition. Dude has an outstanding record, some very solid wins and still has a lot of potential.
He has wins over Mike Kyle, Ovince St. Preux, Babalu, Mark Hunt, Jacare, Melvin Manhoef, Dennis Kang, Evangelista Santos and Hector Lombard. Not to mention he did much more damage to King Mo. All Mo did was hold him down all night.
The dude is legit. Will he win the title? Probably not. But he is a lot better than a lot of the people in the 205 division. If he dropped to 185, he would wreck most of the division.