As far as walk-ons go, it's not as simple as handing them out to the guys who deserve them.
Usually, we will give a scholarship to a walk-ons before the signing period when they are starters and not seniors.
Bak and Christenson could make some sense. I doubt that Eldrid gets considered because a lot of punters/kickers aren't on scholarship. I doubt that Bak and Christenson get awarded a scholarship this season, if they did, it would likely go to Bak (in my opinion) only because he is older. But I really doubt we award either of them a scholarship.
Now with guys like Barker and Mottla, it gets sort of complicated.
Every year, around August/July/September, we will lose a couple more athletes and often HS kids can't qualify. We lost Ferguson and Gjere this year, and unfortunately, that's part of football. However, it's too late to sign another guy. Those open scholarships are awarded to the walk-ons. This is a way to maximize your scholarships. If you award these guys scholarships in lieu of signing another HS kid, if someone leaves the program in August, that scholly is sitting empty (or at least going to someone who you don't think deserves it as much).
My guess is that we won't see any of the walk-ons awarded scholarships before the signing period but that a few of them won't be paying for school next year when it's all said and done.