Isn't XP divided based on the highest level member? So if its LB to you, they'll get a share of the XP you'd be getting? 
 
At a low level for example...a group goes into CB, the lowest member is Lvl 5, the highest is Lvl 9. For certain, if a mob is green to the level 9, the group won't get XP because its green to the highest level (and the Lvl 5 might see it as DB/even, but get nothing). 
		
		
		
		
		
			
		
		
		
		
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