Damn, thanks! Okay, already watched the scenes, and I gotta say, I THINK too that the other girl is meant to be Sinon? Angle is a bit odd and the hair seems wrong, but it literally couldn't be anyone else as it's obviously Hebishima fucking her. The odd thing is that what little they said that Kirito could hear doesn't make much sense at least within the context we know (Doesn't help that one of the lines is 'aligned left'...that's another issue I noticed happening a few times sadly, aside from some parts missing english translation period some of the lines were out of frame because instead of being centered they were all the way to the left side of the text-boxes, Fujino clearly did the machine translation in a big hurry which makes me feel even more bad about him, poor guy clearly is running himself ragged).
Putting it bluntly, Sinon has no way of really knowing anything about both Klein and Kirito that happened "today" (As in that same day) to tell Hebishima...even if she was talking about the stream, it was only Klein logged in and not Kirito at all, and that was the previous day, so maybe we're missing context of something that will be revealed Sunday in-game (During Kirito and Suguha's "date", which is no doubt gonna be crashed by Hebishima). This makes me wonder if this may be how Fujino plans of getting rid of Hebishima, by implying he's doing something "illegal" (At least if Sinon is informing him of names of people for some reason) and he will be caught by it. Either way, next update is very likely when we may know for sure or get an inkling if Hebishima is indeed getting booted from the game or staying around period, given Sunday seems like it will be a Suguha-centric day.
Also, another minor hilarious thing I noticed, but now near the beginning of the game you basically DO get confirmation that Charlie, his girlfriend, and the ugly bastard manager that went back together to their village WERE, indeed, going to the village of his Scathatch/Sakura Chapter game XD May just be a harmless reference, but it would be hilarious if they showed up as background NPCs in the next part whenever he goes back to that game.