See this is where I think you are wrong and where your while philosophy on the draft is flawed.
I think first you just need to admit to us and yourselves that you really really like McCarron.
A lot of your opinions I think are derived from your opinion that McCarron is the best choice at QB for this team. Nothing wrong with thinking that, even thought I mightily disagree but I think your other points would make more sense is you just established that first.
Second I think it is impossible to say that any 5 non QB prospects will have more effect on their team than any QB in this draft. There is no way to know any of these guys pan out or even become the best at their respective position in this draft class. Clowney could end up being a great DE but the best pass rusher in this class may be at the end of the second round somewhere. Robinson may be a solid tackle for years to come but maybe the leagues next great LT comes out of the 3rd...
Just like the best QB in this draft is guaranteed to be one of the top drafted, the same applies for every other position in football.
What can't be disputed is how big of an impact the position of QB itself makes on a team in comparison to other positions and the need to get the right one. This whole system of labeling players on a 0-100 scale is pointless, because at the end of the day you have to have a good QB to win in this league. You don't HAVE to have a great DE, or RT, or WR. Sure it helps, and you obviously need much more than just a QB, you need a complete team, but no single position is more important than quarter back...
And with that in mind and using your system, shouldn't a "92" QB compared to a "89" QB be weighed differently than say a 95 DE to a 88 DE? Because of just how important the QB position is, shouldn't ever little decimal of a point in this system you call to so often matter even more?