Does Gregor's special rules apply if he's added as a Wandering Monster.

[MunchkinMan]

You always fight the Monsters together. There is no point in time where we want people trying to figure out how to divvy up their combat strength against specific Monsters. So, if there's a special ability of a Monster that effects how you handle combat, that applies to the whole combat. In this instance, when Gregor is one of the Monsters you are facing, you'd have to use the Items and Level of the appropriate players, no matter how many other Monsters are involved in the combat, nor with concern for which order the Monsters arrived.