2 things... Calhoun is more a wing/slasher at this point. Probably more in the mold of Kalana Greene before her injury (her game has been likened to Deshields, just not quite as highly rated). I know the OP wasn't saying that Sadie's verbal has anything to do with Sierra's since their games are different.
The other thing - ND has shown and proven that you can never have too many very highly skilled guards. We simply do not have an elite level point guard at this time to lead the team. Moriah will be that but she's not quite there. And 3 ACL's made it impossible for Caroline to fulfill that role either.
Looking at the roster thus far when the 2014 kids come on board, you will have (my opinion) the following:
Pure PG Jefferson
Combo guards Banks, Chong, Edwards
Guard/wings Ekmark, KML
Forwards Tuck, Stewart
Post Stokes
Personally I think Calhoun is a wing or a wing/forward. Plenty of room for her on the team. UCONN is putting together a group of really talented guards and wings. I think we'd all feel better with some additional post players.