I've seen Werdum submit the heavyweight champion and various other people, so yeah, he kind of uses his already established and proven JJ skills don't you think?
There's no need to be patronising.
Your point makes no sense because Gonzaga, Werdum, Silva and Penn would not be afraid to go to the ground.
Do you honestly think Werdum would care too much if Jared Rosholt took him down? Fuck no! And that's from a guy arguably worse on his feet than Nelson is.
BJ Penn's career has been severely tainted because of his stubborn refusal to take fights to the ground, we all know that.