Werdum would beat DC a lot worse than Jones did.
I also think Cain beats Jones. And I definitely take JDS over Jones.
On Werdum - he says he trained with DC in 2010 and took him down three times. Obviously DC was a newb, but taking DC down in training means a lot - it isn't as if DC has improved his wrestling. Also, Werdum has improved his wrestling a LOT since then.
So just because Jones took Cormier down, compared to Werdum that isn't necessarily more impressive.
And obviously taking Werdum down poses tons of problems.
I think without Jones' TD threat, Werdum has the size and length to stand with Jones.
Not saying Werdum is a lock. But I'd make him the favorite.
I'd take Overeem and his 6-5", 80+" reach over Jones as well. Reem's weakness is one shot power, not something Jones possesses, and he has great TDD. And his clinch is deadly, an area where Jones is most dominant. This pick will probably be more controversial than my taking Werdum/Cain/JDS over Jones.