Well, we know it can only be one because 24 players signed on early signing day. Obviously it could end up going to someone else or not being used...
No, a PWO is simply a walk-on that was recruited. There is no implication of potential scholarship. Over 90% of PWO's never earn a scholarship. The main difference is that they count as "recruited" in NCAA parlance, which means they have to sit out a year if they transfer, where a literal walk-on (guy who shows up on his own and makes the team) can transfer anytime, anywhere with no restrictions (outside typical eligibility requirements). There are very few of those players anymore, if any. I'm not sure if any of the Gophers' walk-ons are regular walk-ons...