That's his base.
Just like Madsen's base is Greco.
And TBH Couture, Lindland, Sonnen have a base in scholastic wrestling.
Everyone trains all the disciplines.
I see a lot of guys who miss weight and lose, because they weren't working hard during camp. Paulo Cost who was about 40 lbs over when he entered the ring for the Vettori fight is an example.
Dawson was a replacement, might be why he missed.