No they'd get James Toney'd in MMA. They'd lose to guys in the welterweight class. GSP was able to easily take down a 6 foot 4 250 lbs hockey enforcer named Georges Laroque in an exhibition using pure technique and the same would happen to the Klitch's in MMA. The fukk would they be able to do off their backs after getting taken down? Cain, Cormier, Jones, Barnett etc. would monster them in the Octagon.
Boxers will not beat MMA fighters in MMA
MMA fighters will not beat boxers in boxing

Why is this concept so difficult to grasp?
The streets is where it gets interesting though. I think fighters like Floyd, B-Hop and prime Tyson would shine more than most.
Mayoga just won an MMA about
Ray Mercyer KO's Tim Slyvia with one punch
they've already done it
boxers 2-1 versus MMA guys
when will an MMA guy step in the ring, never
KJ Noons is a pro boxer, but his garbage and will never be a contender
he even bigs wit the boxers telling these nikkaz they don't understand the damage they can cause with just their hands, nikkaz think its game
James Toney is garbage
he was fat and out of shape, looking for a check
not to mention middleweight was he best, he never beat any hall of famers there, he got embarrassed by Roy Jones he did not belong in the same ring as him.
He got NC against John Ruiz, the same guy Roy beat for the heavyweight belt, and tested postitive for steriouds
his record is padded with bums, only name he beat was Evander Holyfield, because Evander was old as fukk.
Stop bringing him up.
The best puncher Jon Jones face was Shogun, and Freddie Roach said he punched like a girl when he came to his gym.
A lot of that ground game will not work in the street, because he perform moves that are illegal in MMA, just like Moyaga did with that knee
he gave the nikka the business showing him in a real fight a lot of MMA tactics will be useless as well