I've never understood why people care about variety of submissions when evaluating someone's sub game.
The more dominant you are, the more you open up the highest percentage subs, which you should always take for the easiest path to victory.
Do people think Ronda doesn't know how to set up and finish a triangle, or BJ Penn an armbar, etc...?
The answer to the question is BJ Penn. His top game and ability to take the back was frightening...now if you want to talk about who the best was off their back...that's a different question