Honestly a QB is either good or not, very hard to be bad then get good. Even Alex Smith still isn't that good.
Good coaching goes a long way also even if the guy needs to start week 1.
You need to look at the games he lost, with good Defenses then you will see it. Doesn't mean anything at college level but it still does look good. Honestly I don't know who could be a good QB though. It is crazy how he can just make plays always looking down field is always a plus.