Who do you think Shroud is?

I think Shroud is someone we already know. I don't think it's anyone on Z team. I think it's Blazer.

She is the first person who asked us about pulse after explosion.

She was against mission to secure pulse.

Somehow Shroud found out about pulse at the same time as we. So he must be at the party.

First I thought she works for Shroud but after episode 6 I think she is the Shroud.