As I've said, zero to be gained by Ahmad returning. The media would have a field day with it, fairly or not. if he was my son, I'd said "great career my boy, now its time to go to the Army."
Word on the street is Carter IS still possible for the fall. He just won't participate in spring ball.
This season becomes the test of Monken's program. If he is a fisher deberry/Paul Johnson/Ken type of coach, and I think he is, then he has to be able to re-load. So, go find 3-4 lineman that want to kick ass like last year did. Go find a QB who won't fumble and can make reads. And leverage the strenght of the 2018 team (which I think will be their defense).
I am confident we will see a 9-10 win team, a win over one of the Academies, and a bowl game. And just 3 years ago that would have seemed like a Unicorn.