The 10-Point Must System will be the standard system of scoring a bout. Under the 10-Point Must Scoring System, 10 points must be awarded to the winner of the round and 9 points or less must be awarded to the loser, except for a rare even round, which is scored (10-10).
Judges shall evaluate mixed martial arts techniques, such as effective striking, effective grappling, control of the ring/fighting area, effective aggressiveness and defense.
Effective striking is judged by determining the total number of legal strikes landed by a contestant. (stats say Jones landed more [barely, I'll call it even just for you] and he clearly landed the most devastating strikes of the round)
Effective aggressiveness means moving forward and landing a legal strike. (Again, Jones finished the round as the obvious aggressor, the early minutes were relatively even)
Effective defense means avoiding being struck, taken down or reversed while countering with offensive attacks. (Jones rocked Gus and wasn't hurt in the round, clearly winning in the defense category)
The following objective scoring criteria shall be utilized by the judges when scoring a round:
a round is to be scored as a 10-9 round when a contestant wins by a close margin, landing the greater number of effective legal strikes, grappling and other maneuvers
If the mixed martial artists spent a majority of a round standing, then:
Effective striking is weighed first; and
Effective grappling is then weighed
Source:
http://www.ufc.com/discover/sport/rules-and-regulations