Deciding a winner up until that final tound would have been really, really tough. Both of them were pulling off some great dunks.
Based on what Dwade said after the contest it seemed someone outside of the judges were forcing their hand on picking a winner from the last set.
I feel like If jones would have took off from the free throw line and not a step inside of it it would have been on par with Gordon jumping over Tacko. I think the Tacko dunk lost points because he got hung up on his hands, which sort of pulled his head down in the process. Whole thing was fun to watch though.