Followup,
I decided to give a scholarship to one of the walkons, a C. He was an overall rating of 416 and I thought he would be a good 4 year bench player with a redshirt.
After I redshirted him, his WE went up as usual, but his overall rating jumped to a 455. His shotblocking jumped atleast 20 points. This seems different.
Hindsight, he will definitely be a good bench player as his attributes are in all the right places.
Any comments on the huge increase in rating?