Long, but I will try to explain it as I understand it to be......
I don't know the absolutes of the 25 per year signing, except that there are numerous ways around that. Many programs take more than 25 on signing day EVERY YEAR. However, they must all be down to 85 by the begining of fall camp. Oversigning programs simply find creative ways to thin the roster in time.... medical issues, transfers, etc...... as many suggest, they review the roster after conditioning and spring practices and cut those that aren't going to play. More of a business model like a pro sports team. They feel that a scholarship is earned and is a competitive position that you have to continue to earn through athletic excellence and contribution.
Those against oversigning, like KF, believe that a scholarship is a commitment on both sides and that once given, is not taken away easily. So, as long as the player meets academic requirements, and puts forth effort to contribute, that he should remain on scholarship.
Obviously these are two vastly differing viewpoints. Players earned their scholarships for to their athleticism and performance in HS, not their academic abilities or community involvement. So, should they be required to continue to earn them for the same thing in college? Or, should they be allowed to slack, and still get the ride?