I'm with you that Sam isn't anywhere close to the QB skill set of Colt or VY. But you might be stretching it just a wee little bit by saying Sam isn't anywhere close to the QB skill set of Steve Buechele or David Ash. That might be just a little outside for ball four, take your base ?
Just an opinion of course, but QB skill set doesnt necessarily equate to effectiveness.
VY's QB skill set was limited and he could not absorb the PRO set or concepts and that's why they had to install his high school offense and, subsequently, let "Vince be Vince". However, his college athleticism was off the charts and more than made up for any skill set deficiencies.
Like Colt, Shane was (and still is) an extremely accurate passer, great anticipation, read defenses quickly pre & post snap, didnt hang on to the ball too long, and manages the game very well; most of which are better QB traits than Sam. So, the obvious question is: why pick Sam over Shane in 2017 instead of redshirting Sam (which I think they should have)? Shane out-performed Sam passing the ball and it wasnt even close, however, Sam lead the team in rushing in 2017 in split action. Obviously, Herman thought (and probably still thinks) Sam fit his power-spread concepts better than Shane and didnt want to wait to install HIS offense.
I said it then, and I stand by it today that David Ash would have played in the NFL if he didnt have to play full back the way Ehlinger does today. I would be very surprised if Sam makes a roster or sees any action as a QB in the NFL but would not have been with Ash. While arguably not the better overt leader early on that Sam was, Ash had a better arm, better accuracy, better anticipation, better vision and passing decision maker, good game manager, and was developing into the solid leader when he got hurt. And, believe it or not, all this with a worse OL than Ehlinger has today