Cosell said that several teams have conducted statistical studies ranging over a 25 year period and they found that QB's who get sacked at a higher rate in college also get sacked at a higher rate in the pros. So the work has already been done.
It took me about an hour to find the stats for Carr, Rattler and Haener and then plug them into a spreadsheet. The college splits for Rattler was quicker, because I just had to edit the spreadsheet real quick. I don't have to time to do what you mentioned. Underhill seems to be a stat geek and he gets paid to be one, so maybe send him a note. I mean that sincerely and respectfully.
Some people say Carr isn't a good QB, so I would think that it would be expected that the good QB's have a lower sack rate than Carr. That might be a little bit of measuring stick.
This is one of those things that isn't common knowledge to fans, but it is to the teams and it will effect how they grade and rank the QB's. Rattler's high sack rate