Paxton has a great throwing arm and is good at connecting with receivers.  What's keeping him from starting is his footwork.  He doesn't move around that well, which is going to hurt him if the Broncos' offensive line doesn't jell pretty soon.  Trevor didn't have an exceptional season last year, but he did pretty well considering how bad the blocking was in front of him.  With an improved O-line and a blocking scheme that plays to his strengths, Trevor not only will start, but he'll do better than last year.