You either grow or you die.  No other sport is that more true than MMA.  In a sport that is in constant evolution an individual fighter must do the same, with the exception of an elite few that have perfected certain techniques.  If it isn’t broken don’t fix it.  If it is broken though, evaluate, learn, practice, rinse and repeat. This weekend is the meeting of those two examples.  One side is Jose Aldo the undisputed king of the featherweight division and owner of  some of, if not the best, leg kicks in the sport.  The other is one of the fastest improving fighters in the UFC, wrestler turned striker, Chad Mendes.  This author thinks Aldo is still going to win, but getting there is going to be much different and much harder.  Here are the five things that have changed in the last two years and why Jose Aldo is going to have a difficult time getting the win in Rio de Janeiro this weekend.