There could be several candidates but its hard to say SU likes to red-shirt most of its frosh unless they feel they are impact players. The initial player that jumps out is Dami Oladunmoye based on his size and athleticism. That said he's not from an historic lacrosse hot bed so it might be a lot ask him to jump from highschool to seeing a decent amount of PT at the high end Div 1 level. Also if SU feels he can make an impact at middie there going to concentrate on training/practicing him there versus SSDM. A guy like Spencer Small would be an interesting candidate especially if SU is looking for more 2 way middies who can stay on and score. Buttermore would be another one but he's probably a several year project type of guy and a definitive red-shirt.
Right now I think you have a few guys planned for SSDM - Hutchings, Schwasnick, Devon Sullivan and then Peter Dearth who has played a see-saw position between O middie and SSDM. At this point the main issue is that SU has to decide what to do with Dearth. Either move him full time to SSDM or keep him at middie. Personally I think he is more valuable at middie but with the amount of talent on the roster at middie right now I can understand if they want to move him. A guy like McKinney in my mind would be a good candidate to move to SSDM, hes fallen far out of favor at midfield and would actually have a chance to play at SSDM. I also think they might move Helmer to SSDM due to the abundance of talent at SSDM right now. Fusco is only a Jr and SU is brining in 3 really good LSM's including Fernandez who is an UA type of player. If they move Helmer you could have Helmer, Hutching, Schwasnick, and Sullivan as your four main guys with a guy like Dearth able to play in a pinch. Plus you could begin training one or two of the frosh to play the position or one of the 30 middies on the roster.