I believe it has been said by Geno in the past that being accepted as a walk-on is really up to the player - as long as they have a modicum of talent, get along with the rest of the team, and make the full blown time/effort commitment they are welcome. In the past a number of them have done the off season thing but washed out a few weeks into the official practice period. It is a huge commitment, unlike anything they did in HS and the reality sinks in. This is the first time I remember there being any publicity about walk-ons before the actual start of practice, but it was also the first time there was any word about actively recruiting walk-ons last spring.