I personally think Rivers was always over rated and as members left that organization his stats dropped and dropped. He has turned into a classic Choke Artist and I hate his attitude and Horn Like eyebrows when he is whinning.
I think Sanchez is mentally broken just as Cassel is, maybe as a back up but if you are saying to lead this team. No thanks.
Now, I wouldn't argue with Alex Smith. He can compete with who ever we draft as our starter. Maybe give the draftee a year or two to develop as an NFL Qb.