Edelin is, of course, my 1b to Duncan's 1a. Not placing blame on Billy; he had a rough time. But I think we would have been 10 wins better with him on the team consistently from 2004-2006 and that he would have ended up the third-best point in school history by his senior year. We missed him.
Terrence Roberts is high on the list; as others have noted, he looked awesome against the Globetrotters and that other exhibition team in fall 2003. 6'9" with guard skills didn't translate in the Big East against other good players, though, and it also turned out that he had hands of stone. Playing on a torn meniscus (and still getting like 7.5 rebounds per), on the other hand, was a selfless thing to do as a senior.
Walton, yeah. Boeheim would have liked him. We wouldn't have had to try that experiment with Otis at the four (and Etan playing the five until halftime, at which point he'd foul out). Probably could've kept the 20-win streak alive and gotten us into the tournament. You know, if he hadn't been a lazy 18-year-old who decided to have someone else take the SAT for him. Oy.
No love for Conrad? He was a McD's guy and probably a player who could have boosted our win totals and tournament success with relatively decent (~13 and 8) numbers. Alas, another kid with stone hands. And another guy who was also loyal and likeable - he showed great patience in dealing with the NCAA shenanigans and suspensions for his last two years.
I was also sorry to see LeSean Howard go. He showed flashes of solid play.
Should Devendorf get a mention? He got McD's honors and was practically ambidextrous - surely no Syracuse player has ever been better at scoring with both hands. But his improvement was minimal, his defensive effort was consistently poor, and he made a fair number of freshman turnovers every year. (And we're also limiting this discussion to on-court behavior.) With his skill-set, Devendorf really could have made a run at Moten's scoring total in four years. Instead...no.
LeRon Ellis. So you average 16 points per game as a sophomore at Kentucky and transfer to Syracuse right as Rony Seikaly vacates his position for you. Your field-goal percentage drops by 7% and you score 6 points per game (with Sherman Douglas feeding the low post, no less!). 11 and 8 as a senior was better, but I'm sure the coaches expected a lot more.
Honorable mention to Kris Joseph. We all like him and acknowledge that his teams were quite successful, but one can't help thinking that the play didn't always match the talent. In his last 2.5 years, only his shooting improved. Health might have been a concern, but a lot of us were justified in thinking that he'd improve his handle, become a 20-point-per-game scorer, and probably take his 5.5/game rebounding average and increase it. None of those things happened.