I will do my best to handicap the list.
I think Farrell is almost a lock to redshirt ditto for Parker if he isn't one of the top two. A lot of hype coming in for Parker though so it might be difficult to redshirt him especially if people struggle.
I like Iacono but injuries have zapped his athleticisim big time. I don't see him matching up well with the bigger and stronger faceoff guys but I guess you never know. I don't think Wentworth is long for the roster. Harris is a complete wild card mostly because no one knows if he will actually make it here. Assuming he does he has the skill to compete for the job and or get some run on the back up mid lines.
At this point I have to think your looking at 4 or 5 legit contenders for the job. The top 5 to me are Paduda (assuming hes actually healthy), Demarco, Parker, and the two new transfers William and Vehar. As I noted Vaughn Harris is the wild card because I have no idea if he actually makes it here. If he does the top 5 becomes the top 6. Demarco, Parker and Vehar all have red shirts available, I am not sure about Williams. Either way Desko will have a S ton of options.