This fight is gonna happen on the Fury vs Wallin card. Given that most of the champions are with Top Rank, there is a good chance the winner of this could get a title shot sometime in the future.
You're just misremembering the Paul Parker fight. Similar stature, similar look. I think Valera stops him in 5 or 6. He would have stopped Barrera had he been able to land on him more. Valera doesn't lack pop, and if he can and clean he can hurt you. Well, Slava isn't known for his defensive prowess is he?
Then it really gets confusing since Barrera has also fought Parker and Valera, while Slava has fought Barrera as well.