I honestly hope there isn't as if a group of six clan members all know eachother and end up in a match with two randoms they will be inclined to help their clan members leaving, leaving the two randoms in the dust.
It wouldn't make a difference if there are clan tags if theres a group of people with that mentality it will happen it's not like people look for a clan tag and that the only way they know there pals, especially in a game that allows your "clan" to have a theme like a clan color.
Honestly i don't know but they have talked about clans alittle i'll try to find the vid.
Oh he just talks about having a clan color and his was orange he didn't say anything about clan tags.