VirgilCain said:
why not just ask him to the kid to walk on and then evaluate whether or not he deserves a scholly in spring? seems like a damn near 100% way to waste a scholly.
The difference is the walk on starts his eligibility clock immediately.
For instance, let's take Mike Marry and Andrew Ritter as examples. Both signed in our 2009 class. Marry took a grayshirt. Ritter walked on. Ritter's clock started in the 2009 season, so his eligibility is for the 2009, 10, 11, 12, and 13 seasons, if he were to use a redshirt in the future.
Marry enrolled part time in the fall, and he goes on scholarship this spring. His eligibility clock starts with 2010, so his clock includes the 2010, 11, 12, 13, and 14 seasons if he were to redshirt at some point.
There is definitely a difference. The walk on pays full time enrollment the first year and gets to join the team. The grayshirt pays part time enrollment the first semester and doesn't get to join the team until the spring.
Ritter = preferred walk on
Marry = grayshirt
And for the record, the only reason I could see why you would accept an offer like that over other immediate offers is if you really like the program, coach, or school that much better than the others you are considering. In Ritter's case, he grew up an Ole Miss fan, so he was willing to walk on at Ole Miss over taking an immediate scholarship at Arkansas.
ETA: Grayshirting is something like an extra redshirt year, with the main difference being that during that grayshirt semester, you can't use the team facilities, you can't practice with the team, and in general you can't do any team activities. You are essentially a regular, non-athlete student. Marry and Swindall both had to work out at the Turner Center on their own to stay in shape this fall. The staff is allowed to give them a work out plan, but they can't supervise and they can't enforce it.