I have a very small sample, because I'm only in my third season, but I do have a couple players whose data might be worthwhile. Obviously, these ratings are as of now. Guard C is younger and therefore probably has more discrepancy between what he is now and what he was before.
Guard A: 58 SPD, 46 BH, 97 PER. 47.0% as a sophomore, 47.6% as a junior, 50% through three games as a senior
Guard B: 47 SPD, 54 BH, 83 PER. 44.8% as a sophomore, 47.0% as a junior, 41.6% through three games as a senior
Guard C: 81 SPD, 65 BH, 72 PER. 36.3% as a sophomore, 46.2% through three games as a junior.
If I remember, I'll update at the end of the year.