When you fight you lose energy and because of that you lose training time. I would love idea about fighters gaining from fighting. Like when you take real fight you would gain 20% more experience for next two weeks or something like that.
Of course some people would try to abuse this.
On second thought maybe it would be just easier to reduce energy loss from fighting or increase energy gain from resting at low energy.
I think he means that with the guys winning by decision, keeping a tally of their point differential. E.g. if you win a decision 10 points to 2, your differential is +8.
I think it's also another way of being an additional tiebreaker on top of your bonus submission points.