I like him and if he didnt waste his prime in jail he could be a threat. But hes comingup at his age, i really doubt it. Add to that there is no threat to Vitali including his brother.
If I were Vitali I'd be more concerned about the wierdo in his mum's basement with the "Hacked by Bart" Avitar. He is clearly unstable.
At this point in his career, why is this even a discussion. Is this Amir Mansour with 16 fights, 12 koes. Only 6 of his opponents have winning records with several loses with those wins. He did beat Dominick Guinn by decision recently, and if that is his best victory, I think he has a ways to go. Put him in with Areola, Ademek, some of the russioans guys, Thompson, Rodriquez and let's see what happens.
mansour would feel like he droped the soap in the shower back in the joint the way vitali would have with him.