ok, I haven't been in his campaigns so far. However, I believe that he does not prioritize this condition, especially if someone applies and is already in another campaign.
I also do not think he enforces the rule in his campaigns when picking participants. He is one manager who does not like to give free advertisement to projects so it is expected he will not enforce such a rule.
Yes, it will help to not include it in the rules if it is not enforced.
- Jay -