Yeah, you have to redshirt them. If you play them, they need hit the % or they will lose WE. I've actually had players I promised complain and lose WE when they were right at the exact number, so you need to be over.
***Not 100% sure on this next strategy, but I believe it works***
If a player doesn't play at all in a particular game, it doesn't impact their total % of plays for the season.
So, if a player plays 100% of plays in the first game season, they will be at 100% (obviously).
Then if the same player plays 0% in Game 2, they will stay at 100%.
As long as they don't play at all they will stay 100%.
Be careful though, because if they accidentally get into 1 or 2 plays the percentage will plummet.
** I haven't actually tried this over a full season, but I have heard from others that it works. I'm not trying to screw anyone. **