This much is clear, LBJ is a power-dunker - tomahawks & bringing down the hammer kinds of dunks ............ somewhere in the lines of Dominique.
I agree with @lithium_deuteride .......... recent dunk contests have been geared more towards creative high-flyers/contortionists - not to say that DJJ, LaVine, Gordon, Diallo, etc didn't have power, but their dunks had nice combinations of flair and power.
Even LBJ knows this ........ ibang-iba ang in-game dunking sa dunk contests.
Besides, there's not much incentive for one of the ATG's to participate in a dunk contest.