Experience gains question

[snyder43]

Correct me if I'm wrong, but doesn't the exp per mob depend on the highest level PC in the group?

So, if you're in a group and the mobs all con dark blue to you, but they con light blue to the highest leveled member in the group, the exp the group gets would only be 50%, correct?

We had a situation in CoM last night where two of our members insisted on staying at the stables, although half the mobs were light blue to the higher level members in our group and the exp wasn't great anymore. We moved to the arena, cleared it with time to spare, made better exp than the stables, yet the two members of our group were unhappy that we weren't killing as many mobs as at the stables.