Maybe what they're hiding from Coulson is that Fury stained his precious Captain America trading cards with blood, lest he go berserk
Really enjoyed this episode, glad that Fitzsimmons got the focus but everybody still had a lot to do. The characterization was the real strong point of the episode. More of the same please.
I like the idea of Fitz eventually turning into a villain after feeling ostracized, if a love triangle between Jemma, Ward and Skye happens, as someone else mentioned upthread.