Multiclaning can be considered unloyal, and it is indeed a problem alot of times, like when 2 clans got an event at the same time, or they fight themselves , but I think the TWR rule is ok, because as long as that someone isnt in two + TWR list they dont affect the ranks.Is not like them being in a clan outside of TWR give their clan any kind of advantage , or affects the ranks in anyway,infact I would say it gives the TWR clan a disadvantage cuz they might prefer to be warring/pking with their other(s) clan rather than the TWR one. If that person however is in two TWR list then it indeed would affect the ranks and would be unfair, so I think the rule is ok.