If Reyes had been ruled the winner, I would be saying "Jones didn't get robbed". When the fight is that close, you can't really complain either way. Personally, I had it 3-2 Jones, but I could easily have seen it 3-2 Reyes, and I even see justification for 4-1 Jones (Round 2 and 3 were close enough that they could have gone to Jones or Reyes). When the fight is that close, you just have to pray that the judges are on your side. Zero robbery. Zero conspiracy. It was a good, competitive fight with multiple close rounds. When there's more than one close round, the judging can swing drastically.
When I finished the fight, I said "Two judges are going to have it 3-2 Jones, and one will have it 4-1 Jones, but I won't be surprised if it's a split decision either way."
Judging is tough. Really tough. They can't get it right in boxing, where the rounds are only 3 minutes and they are only punching. Picking a winner of a 5-minute round, where you have to evaluate striking, grappling, cage control, and submission offense/defense is no easy task.
The fact is, Reyes banked everything on winning rounds 1-3, and he had nothing left in 4 and 5. He did a great job against one of the best to ever do it. He left it up to judge's discretion, and the judges chose Jones. That's the way things go.