Well, this guy knows -- he's Conor's training partner -- and tells TMZ Sports the raw power is strong enough to OBLITERATE every bone in Khabib's body.
Meet John Redmond -- a pro MMA fighter who's been training with McGregor for years at the legendary Straight Blast Gym in Ireland.
In fact, you might remember John as the guy who was fighting at Bellator 187 last year when Conor jumped into the cage and started going berserk on the ref. Good times ...
Now, John says Conor is just too strong, too skilled and too experienced for Khabib -- HE'S GONNA SMASH THE GUY!