what makes most sense to me is either mafia had an extra kill they used n2 that belonged to cp/shawn's role or cp is a serial that did this
n1 - commute
n2 - kill barry/wang (whichever mafia didnt kill)
n3 - commute (dodged my coal shot here)
n4 - kill poyser. lethal was lynched d4 so in this...