All the current title holders? Is that true? Maybe it is. I dunno. But it certainly hasn't been reflected in the fights. The current trend, the one we have been dicsusisng here lately, has been one towards GNP. People have been coming in with MUCH less grappling expertese than they used to. People are learning how to punch from the guard. The grappling domination is 5 years ago if not 10.
The avaerage UFC fighter only focuses on ground skills if they know they are going to be facing a grappler. Then they train hard for 2-3 moths. That just don't cut it. It takes years. It is no accident that all the current title holders have strong wrestling backgrounds. They spent years doing it.