Are those two extra intelligent zombies? If they aren't, their activities don't seem to make that much sense. They want to take the mountain resort for themselves? For what purpose? Those two guys are going to live there together, alone, huh? After this killing spree, nobody's going to cooperate with them willingly, which means they would be looking over the shoulders for the rest of the lives, in a world filled with zombies. Of course they might just be comical psychos who want to kill a person or two every day just for the kicks, but come on.
Unless the author really surprises me, I can't view this as anything but haphazard, poor writing.