I have been reliably informed that if i have only one co op and i decide to remove them it would be wise to fill my other co op slot first. No matter how many co op slots i have available i can not add a new co op immediately i have to wait 7 days. I would like to suggest that this is changed. I don't see a problem with waiting 7 days to fill a slot i have just emptied but i think that you should be able to fill a slot that has been vacant for more than 7 days immediately. I don't see the logic behind not being allowed to do this.