Seagal says he's been drilling striking and defensive wrestling techniques with Silva, but he also says there are techniques they thought were illegal, which turn out to be legal. I'm thinking maybe wristlocks and other holds?
Opinion on Seagal is varied so think what you will about this.
Jones vs Evans, when Jones was holding his arms out toward Rashad's face before whipping his elbows in, there are several techniques Rashad could have easily applied to submit Jon standing, basic wrist/arm locks which are hard to deal with. I wonder if many of these moves are assumed illegal because of how effective they are? End of the day, it's a limb lock like any other. Just a thought.