So, I've run into this situation about three of four times already on Xbox NA on the last couple of weeks:
You queue into a random dungeon or the daily pledge and is put into a group where two players, usually a Tank + DPS or 2 DPS have basically the same gamertag with some small variation (like BestPlayer 1 and BestPlayer 2).
Usually just one of these players actually plays the dungeon. I think all those times the one playing was a max CP 561 DPS. The other, usually low level, just sits and waits at the entrance after porting. If you initiate a vote to kick, it never passes because the other player always decline it. I know it is the other one because either I start a vote or I can see the fourth player in the inventory screen right before the vote prompt.
A couple of times this happened and we could finish the dungeon without a problem, but yesterday we queued for Mazzatun and it was just impossible as we didn't have enough DPS. Me and the other player tried to initiate votes to kick the idle player several times, just to have the voting failing. We eventually quit the group.
I've noticed that sometimes they move a little bit foward in between bosses, but never join the fight, and I assume is to avoid being logged out for inactivity.
Is this a thing now? What is this? Exploiting the XP and keys?