SJ and JB needed the QB competition because neither of them really stepped up and took the job. That was seen in the regular season with their inconsistency from week to week and losing the job back and forth.
I think Sam is well ahead of either of these guys as far as a starting point. He has a good mix of talent and command of the offense, whereas the previous QBs were inconsistent in one way or the other.
Sam was solid for the most part last season. I think he deserves a pass on the bowl game as he was reportedly ill and his offensive line got absolutely whipped at the line of scrimmage. Now his numbers looked pretty solid overall...
46-79 / 541 yards / 8 TD's / 1 INT / 58.2% completions
41 carries / 233 yards / 5.7 ypc / 1 TD
Those are very solid numbers for a kid stepping onto the field in college for the first time. I am sure the offense was a little foggy for him, the reads on throws were a bit uncomfortable, his excitement level had to have been through the roof, and I am sure (I doubt he would admit it) he was being a little "safe" with his throws and not taking many chances so he would avoid making the big mistake. Now those are just assumptions and maybe that wasn't the case but I promise you if I was in his shoes that would be exactly the case. His grasp of the offense is only getting stronger, the reads are going to get easier, and as his comfort level grows that tendency to play safe is going to go away. I don't expect him to put up ridiculous numbers but I do think his production is going to see a fairly big jump up this year.