Like the story for a bit, but definitely not Marcus one bit. It's really obvious he has something to do with the disappearance, I say that because it's obvious now that his obstacle is gone he can get what he wants. Not only that but Cal hasn't had any time what so ever to process what happened and is obviously being pushed in a certain direction by everyone, except for Lupe. It just extremally feels like Cal is being taken advantage of and no one around him is helping him what so ever and the only person who could really help him, Lupe and David, are no where to be found. Hopefully someone actually helps him and finds David before it gets too late for both him and Cal