Best doesn't necessarily mean the most DPS.  
 
Thing is: shaman is both worse DPS and worse group composition here. The healing and charm recovery is covered by the cleric, so what does shaman possibly bring to the table?  
 
In this case, wouldn't the high safe DPS and nuking bring more to this group than the redundancy that is shaman? 
 
And the people in the thread have covered why this is. It's time to admit checkmate here. 
		
		
		
		
		
		
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