A few weeks ago I was running CM through the roulette as a DPS. We had a tank drop or d/c right at the start. We worked our way all the way to the 2nd boss and still didn't have a tank pop in. We wiped at the second boss as the one tank we had was fairly new. I offered to be kicked and then rejoin on my PLD.

When I tried to re-enter through the queue for roulette it wouldn't put me in an in progress party and gave me a normal "less than 5m" wait time. Gave it a few minutes, but in progress never popped up. As soon as I left the queue for roulette and just queued for CM it popped right up and I joined the same party I left. Led me to believe there are issues with joining an in progress party through the roulette.