Nowhere did I write "they let you skip a fight if you get a finish". It can work out that way though.
The regular season is two fights.
Fighter A wins his first fight by a first round finish, earning 6 points. He then gets injured and misses his second fight.
Fighter B wins both of his two regular season fights by decision, also totaling 6 points.
In this scenario, both fighters have 6 points and make the playoffs, despite Fighter A only fighting once and Fighter B fighting twice.
Alternatively (although no one would ever risk it, it is theoretically possible), Fighter A could achieve his 6 point finish in his first fight, while Fighter B gets his 3 point decision in his first fight. A healthy Fighter A could then make the conscious decision to sit out if he thinks Fighter B will win another decision and not surpass him in points.