They looked either torn or damn small - you can not see his biceps at all in the rear double biceps pose
No, neither his triceps nor his biceps look torn in the back double biceps or from the sides when he does the quarter turns.
He looked very smooth in his frotn lat spread comparison to Nasser.
Excuse me, but I assume you are joking. This post can't possibly be serious. Not only does Dorian look infinitely harder than Nasser - not even in the same league -, but Yates' lats flare wider as well. Methinks your preference for Nasser has more to do with his ethnicity rather than with his physique.
I have yet to see his front ab-thigh comparison, but I doubt he looked better than Nasser in that pose either, as that was one of Nasser's signature poses.
Nasser might have a smaller waist in this mandatory, but Dorian's abs are more defined and his lats are wider. Overral, I think it's a tie. In any case, it is immaterial because Dorian wins 4 of the six mandatory poses as well as the symmetry round - except from the front.