Werdum's enhanced training regimen focusing on strength and conditioning, coupled with his marked standup development has given him impressive tools to complement his "best in the world" BJJ, which put together makes him a threat to everyone at HW.
I wouldn't be surprised in the least bit if he ends the year as HW champion. Cain and Cormier probably wouldn't want to mess with his guard, so it'd be a striking affair which I think would be somewhat close and all four other top HWs(Cain, JDS, Cormier and Overeem) will have a difficult time at this point in Werdum's career, as he's not just a grappler anymore. Not to say he could beat all four at this juncture, but he's legit for sure.
MY MMA RANKINGS
HW Cain JDS Werdum Cormier Barnett Bigfoot Browne Miocic Napao
LHW Jones Goose Evans Texeira Davis Hendo Shogun Manuwa
MW Weidman ASilva Belfort Jacare Machida Rockhold Munoz Kennedy Bisping
WW GSP Hendricks Condit Lawler Maia Kampmann Rory Ellenberger Askren Lombard
LW Pettis Bendo Alvarez Chandler Grant Gil Thomson Diaz J.Miller dos Anjos
FW Aldo Mendes Lamas Frankie Cub Lentz Kawajiri Zombie Elkins
BW Barao Cruz Faber Bibiano McDonald Moraes Assuncao Wineland Dillashaw