I know he's mostly retired in ring, but a William Regal v Rusev match might have been a good idea.. Regal can be really gritty and violent when he wants, plus the crowd would be eating that up. It would be slow paced, but it would be violent and the crowd always goes into a frenzy when he's there.
And I agree about his moveset. The first few times I watched Rusev, his wrestling pretty much told the story of his character and he doesn't really need the theatrics to add to it. He can speak through his actual wrestling.