I think the reason that Sergey gets little recognition is that he's not very expressive. He has good, solid technique for sure, but he doesn't do anything to stand out. And with a partner like Tiffany, beautiful and graceful with expression and charisma to spare, a guy HAS to be able to project some emotion or he'll just be overpowered by Tiffany.
I'm sorry but I had to mark him down for that yellow blonde hair. Why can't brunette men understand how good they look with natural hair color?