Academic excellence is always to be praised. Both Rutgers and Arizona have touted the positive stats relating to various teams, the athletic program as a whole and in some cases individual athletes. Never doubted that UConn athletes would have good grades, I think it is an attitude thing among the coaches. At Rutgers, at least in the old BE days, Greg Schiano was very into the academics of the football team.
I do think a comparison with the university as a whole would be instructive. I'm 45 years out of college (Oh my Word) and there was a certain amount of inconsistency in grading even then. Folks matriculating within a department generally got at least a little more lee-way than others, and even then other subjects - I made the mistake of taking an advanced math course that was, to be honest, a bit over my head. When asked in the teacher interview (part of the grade) how I felt about the course, I acknowledged being a bit out of my depth, in spite of prerequisites and a decent GPA. I got the equivalent of a "B" - although I almost certainly failed the final exam and didn't deserve better than a "D" - and no one in the entire course got below a "C" and very few of them for that matter (this was the days of posted grades on the prof's door).
In a bit over 120 credits I never got below a "B" except one "D" that should have been an "F", but it was Organic Chem Lab (mandatory for a Chem major). An honest assessment would suggest that, while I was certainly a decent student, my GPA was a bit higher than my actual learning would suggest - and this was 45 years ago. So I suspect a "hard" evaluation is impossible.