My room was taking ages to fill so I ended up playing with no aircraft restrictions which meant some 1400s joined. I, uh, seal herded them for two games and then we got an SR4. I let them stay because kicking them would have been a dick move, but it seems they got bored waiting for me to invite everyone I wanted and left on their own. Or maybe they were in a hurry? I don't know. One asked me to change the number of players away from 8p and left when I said no, the other left without a word after a while.
I'm actually a little sad about it because carrying 1400 MR guys to S rank on a level 4 raid would have made me feel like a nice person, but it wasn't to be.