Happy certainly has seen Carrington more than me and I respect his opinion a great deal. That said, in the three times I have seen Carrington, I believe he would be a solid addition. He has good size, will fill out more IMO and has a nice upside. Agree with Happy that he is not a PG, but still well worth recruiting.
I love Williams' toughness and winning attitude and hope he evolves into a BE level player, but I think he has a way to go. Could be wrong.