Is there a way that I can remove an owner but still keep his team in tact so that another person can come in and take over the team?
Go to Commish Options->Remve Owner/Delete Team
If you click it once, and an owner is present, it will keep the team in tact. The players will stay. So go there and remove him by clicking that button, it won't release his players, it will just have an unclaimed team that you can invite a new owner to and they will inherit his players.
If you remove the user, then go back and delete the team by clicking the same button, the players on that team will be removed, it will not stay in tact, so don't do that in your instance.
Thanks! Very helpful.