User blog comment:Mathias Custos/Could there be a fourth?/@comment-10380701-20131220234926

Nah. Doubt it. From the looks of episode 16, Sun doesn't know who Penny is. Their only interaction was a one-sided "Woah!" from Sun.

I don't even think those two are on a team.

Meanwhile, Velvet's team is just about ready to show up in the next volume, now that she has a combat attire on the backburner.