Having played Emory several times, I have a very high opinion of his skill level. He is a naturally talented player, and I found him to be quite strong in complicated endgames as well.
However... it is not really reasonable to compare him with somebody Kasparov's strength. Kasparov was trained by the best trainers and played the strongest competition since he was a young boy. I imagine he has more wins vs World Champions than Emory has vs GM's. I know in the past he beat a couple of entire Olympic teams in simuls - teams that had 4 or 5 players Emory's level on them.
Having said that... in one game, anything could happen.
He's good, but he's inconsistent as a player. He really suffers when it comes to converting advantages though.