A lot of that is true, but the thing we haven't seen him do is run the offense on a consistent basis or throw with accuracy. Even the big play to Harris in the Vikings playoff game was an under throw. And running a few plays here and there is a lot different than facing a defense that has specifically game planned to defend you. That's one big reason it could be different and when he has played in preseason, he has gotten better, but we still haven't seen him play a really great game where he dominates another teams' backups.
I'm not saying he can't be the starting QB. But it's no sure thing. And signing Winston and only giving Hill a two year deal certainly seems to indicate that the Saints want to give themselves some time to see if Hill can develop as a QB before having to commit to Taysom Hill, franchise QB.