MMA gives the advantage to surprise. Zimmerman was surprised, sucker punched as it were. MMA also favors the stronger contestant. That would be Mr. Martin. The real deciding factor for Mr. Sharpton is, of course, the race of the loser and the race of the winner. Nothing else contributes to any perception of guilt or innocence.
Which is a laugh, because Mr. Zimmerman is probably blacker than our current president.