Sheehan is on a video concert with Steve Vai, and he is very good. And while I don't want to speak ill of him, I can only wonder what condition Mr. Sheehan was in when he did the clinic. There's also a video of him at a bass day, and he seemed a bit wired. Perhaps just personality, but folks playing at that level don't have off days where they can't keep time when they're on stage doing very intricate runs with someone like Vai and still keep their jobs.