Characters of Chance, Ravel, Patrick Wilson info or speculation?

Any thoughts on the guy who wears glasses and is allways (except in Temple) in a hoodie, and other non major characters according to the trailers such as Benedict Wong, Chance, Patrick Wilson, and the thin Scottish gentleman? When Captain Janek shouts"who opened the door!!" it points at some sort of defiance of a direct order or sabatoge. Any backstories for these guys or are they being kept out of the picture until show time? btw these are very good actors , I have seen some of their works.