Personally, I think saying Mussini is a "third guard" caliber big east player is insulting to him. He is having a fantastic freshman season, while being asked to play out of position, and an unreasonable amount of minutes and responsibility for a freshman.
Jimmer Fredette averaged 7ppg as a Freshman and 16 ppg as a soph. I'm not directly comparing the two skill-wise, but let's give Mussini some time before we declare him a "third guard" next season. I'm betting he will be our minutes leader next year as well.
Obviously, there are differences between Fredette, Reddick, Curry, and Mussini, both in talent level and playing style. But there are also a ton of similarities, so for that reason, I think it's fair to compare them.