I can actually see and agree with everyone's point of view, if that's not contradictory in itself.
If Im running a clan I want my guys to be loyal to this one clan, and put all their effort into it. They carry the banner, and when the team wins because of the clan, the clan gains prestige.
Now the idea of other players wearing the banner to fight in crpg battles without being members is also fine with me - it's just the same as me hiring them for a strat battle isnt it?
To be honest, the idea of playing with greys/drz etc actually appeals to me because I never get to play with them - not to say that I dont want to play with fallen/hre/templar etc, just that Ive never ever fought as a team with anyone from the Union ever.
If I considered someone a member of the clan Id want them to put the clan first when it comes to playing in crpg or strat - one reason is that if members just play with whoever whenever they want, the clan will definitely dissolve.
While im playing c-rpg casually, and not often, I wouldnt mind jumping in other peoples ts - i used to do that anyway if no clan members were online, but I wouldnt always be on the right team which is the only reason id want to use their banner.
I wouldnt see myself playing in other clans ts every night if I was in a clan myself though, Id want to be in my own clans ts for whenever someone else from the clan is playing.