really only a question:
in one of a current game our opponent team has members from 3 different clans. they obviously started as out of one clan. this is somewhat strange... so they are fighting under the flag of their new clan and collecting points for their old ?!?
No, they are still battling for their old clan.
It often happens that people switch clan midtime of CL. This has never been a problem, since the rosters of the clans cant change while the league is still running.