I never liked Marco to start with and Lucas is being such an idiot (and a jerk to everyone around him) that I can't wait for him to learn the truth.
Marco is an idiot to want Lucas at Wyndemere anyhow. It's only a matter of time before Lucas discovers something or overhears the wrong thing. Maybe he will get tossed into the catacombs with Anna. I find Marco to be just as bad as his father. Maybe he hasn't personally pulled the trigger on someone but he knows every dirty thing his father is doing -- the murders, the blackmails, the kidnappings, etc. -- and he's going along with it without question. He better catch the same hell Sidwell does.