I think this talk needs to stop. The man has defended his title 8 times, and is on his way to becoming the mos dominant champion in MMA history. From now on, the opposite needs to be said in that Jon Jones will be the biggest test his opponents have faced. Like him or not, Jon Jones is now the standard in his division, and in MMA. There is no facet of MMA in which he has not bested his opponents in. Striking, Wrestling, Submissions, Grappling, Stamina, Strength. He has bested his opponents in all of those areas. So be it Rumble, or Gus, they will not be the "biggest test Jon Jones has faced". He will be THEIR biggest test because they haven't beaten anyone like him.