Vinny taps Davis in under 10 minutes if this gets to the ground, his BJJ is that superior, even someone of Davis' grappling caliber.
Just my opinion and I'm a BJJ guy, but I don't like the style matchup for Davis, even though he's thoroughly skilled in subs himself, Vinny is on a level almost entirely by himself at 205, with maybe Cruz and Drysdale in his company(within the MMA BJJ game)
You also gotta keep in mind, when looking at Vinny taking the fight on short-notice, he'd have to cancel Christmas and come down in weight, as he's an extremely big LHW. I don't think he could've made it in time.
MY MMA RANKINGS
HW Cain JDS Werdum Cormier Barnett Bigfoot Overeem Mir Browne Nelson
LHW Jones Machida Evans Hendo Goose Teixeira Davis Shogun Mousasi Bader
MW ASilva Belfort Weidman Jacare Okami Rockhold Kennedy Consta Bisping Boetsch
WW GSP Hendricks Condit MacDonald Diaz Maia Fitch Kampmann Ellenberger Pyle
LW Bendo Alvarez Grant Melendez Thomson J.Miller Diaz Pettis Chandler dos Anjos Gray
FW Aldo Mendes Curran Lamas Frankie Zombie Cub Lentz Kawajiri Siver