Werdum took Bigfoot down with a head drag... And that isn't an isolated incident. His TDD is consistently garbage.
I'd put the likelihood of Brock taking him down as very high.
I haven't seen much offense from Bigfoot off his back when he's been there (even against a low energy, fat, celebrity rehab version of Ricco Rodriguez) so I'd make Brock a pretty decent favorite on this.
Some people think that they can convey either a philosophy on life or a complex political statement using a signature on the internet. I'm not one of them.