not sure what you mean about asking for another year of eligibility. The only non-redshirt way to get another yr is through injury (I hear - I've never had nor heard of it happening, but its in the rules...) which is applied automatically if conditions are met. Because he played, he played - you may as well put on the depth chart somewhere and get him into some games for experience. Like al said, you can try to redshirt him as a soph, and then you'd get a 5th yr naturally, but the recruiting inform expires with this season, so he may not (likely won't but I have successfully redshirted sophomores) take it. Good luck...