Here are my thoughts. Carwin has knockout power and Lesnar does not. The only person he damaged with punches is Couture. Mir was not a knockout. He pinned his arms down with 265 pounds of muscle and hammer fisted the poo out of his face, still not knocking him out. Carwin could end this with a well placed wrecking ball of a hand as seen in 12 straight fights. Lesnar will not...Carwin has a chin and a half.
Flipside Lesnar can wrestle a small Hyundai and win. He will have to shoot and tie Carwin up. I dont think Carwin has ever really been challenged on the ground as all of his fights end in the first from people, even Mir, trying to play billy bad ass and go toe to toe.
I dont like either of them, but I see Lesnar taking this by ground and pound or submission...I dont think even he wants to go toe to toe with Carwin nor do i think he could.
Ps....Evans will beat the stuffing out of Rampage.