Yesterday a certain player started the day with team 1, joint our team (team 2) for a few hours, and ended up with team 3 in the evening.
For which team do his points gathered in the team competition count? Do they only count for the team with which he finally ended up or are they registered with the team he was a member of when he played these games?

To clarify the situation: I have no intention to altering our team to "invite only" or "closed", for this would exclude players with a genuine interst of joining our team. It's only because some of my team members found the players' behaviour rather odd that I pose this question.

I think it's the team the player is with at 11:59 pm, but don't quote me on it.

A player briefly joining is probably an indication they didn't really like what they saw - maybe they were looking for more/less competitive, more/less activity standards... players can't really check a team for style without joining and reading up some on the message board.