Some new theme bug that is allowing 1 DH (1739 paragon) to do a GR150. Saw another player do a Wiz, WD, and a Necro do 150 GR. 2 Crusadors done 150 GR, and fifteen barbs. 
All of these are seasonal GR’s.
I failed to see the thread about this. Season Theme Feedback - No Area Damage% 150 as zDPS still possible - #8 by MysticGlow-1734