It was Mark. I spotted Joshua also. Didn't see Lauren though.
Hok was in fact there, with some of his crew (Quest Crew), which also included Ryan (S1) and Dominic (S3). I'm pretty sure I saw Dominic, but I don't think I saw Ryan. That whole dance segment on the Emmy's was to represent all the dancing shows, and Hok and Dominic represented ABDC moreso than SYTYCD, since Quest Crew won that show.