I've stayed out of this because it isn't particularly interesting to me for the most part, but will offer a couple of thoughts. 1. you need enough players to go five on five in practice...10 good players min. Having the right 11 or 12 is okay in case someone gets hurt for practice. I don't see Purdue needing that many to play in games, but I do to maintain quality practices. 2) players seem a little more self centered in general than years ago...PJ being an exception. That said a couple of disgruntled players not getting the playing time may hurt the team chemistry. I think it is really hard to play more than 8 the majority of the time..perhaps a stretch to nine, but the ninth player many times is a gap away in the minutes from 8. What happens to the players that don't get the minutes? How do they practice? What attitude takes place outside and away from the coaches? How does that affect the friends that maybe think they should have more time than another player? Bottom line IMO...practice dictates more players than the game, but any extra players needed above practice, need to be players that are really happy just to be on the team.
In reference to your #1, I am sure there is at least one kid at the Co-Rec they could find that would be a suitable practice player only. Hell, when I was at Purdue...had they asked me that, I would jump at the chance to do so...along with all the free stuff I would have gotten. I played on the women's practice squad for 2 years and it was an amazing time.