You should have IR roster spots. You should find a replacement manager for that team.
The most critical aspect to any dynasty league is retaining active owners. Otherwise, you league will become short lived. Owners with bad teams may quit. If the league is too top heavy, owners outside of the elite may quit. As a commish for a dynasty league, everything you do should in some way promote the longevity of the league. Consider having a co-commissioner to help you out. If the standings and/or rosters are remaining too stagnant after a few seasons, consider a partial re-draft.
1. How do you expect him to draft Charles?
2. Even if some stupid owner didn't keep Charles and this guy drafted him, do you realize how much of waste it would be to have a 3rd RB instead of the Gordon, who despite missing the first two games of the season, is the #1 fantasy WR so far this season?