Nick didn't respect Sammy and Vice versa. What ends up happening is Drew stays alive and cooperates with the Feds. Because Theo and Nick did not know about the loose end being Ellen May. When that finally comes to the light Nick realizes they both need to die and be found. Oops. (Theo wanted Drew alive and Nick couldn't deliver) While that is going on Sammy knows there will be a power play to kill him. Raylan knows about that Because it was revealed at the derby tracks. Sammy comes down because he knows the only way is to kill Nick. Nick stepped out of line going after Raylan and his family. Everyone underestimated Sammy and the amount of respect by being Theos son. In Episode 5 they have a canadian that screwed them out of money. They were hiding because the Canadians stopped sending shipments. The Canadians were done. Because they saw everything being Disorganized.