Yea, he physically looks a little like Blackwell but otherwise it's a weird comparison. Blackwell was very skilled but an underwhelming athlete who sometimes seemed to coast. Moyer might be a little more athletic, but so far is miles from Blackwell on a skill level. On the other hand, no one will doubt his motor. If all we are saying is he isn't a great athlete, that's a very bad sign because Blackwell had a lot else going.
I don't think he's the athlete Roberts was, either. But I think he'll have a better career. Roberts, pre-injury, was maybe the most incomprehensible player I remember - a tremendous athlete who clearly gave a damn and showed flashes of brilliance but never put those pieces into a legit be level player. That his most lasting memory was hitting a three pointer to beat Rutgers is an almost too-perfect incapsulation of his career.
Truthfully I think the best syracuse comparison might be kristoff. And that's not a terrible thing!