. Vanderlei got beaten up badly by Tito Ortiz. The way you beat Vanderlei is with counters as he runs in. Not taking anything away from his accomplishments. But thats how you would beat him.
1) Wanderlei's lost to tito was controversial. silva knokced tito down and then chased him across the octagon to give him a few more cracks. they were both kids, jus look at that fight compared to them now. silva wont be known as p4p greatest if he could be simply beaten as you have said.
he's never been knocked out either, he handed rampage, kondo, and saku there first ko and tko loses.

2)in a boxing match a boxer is very likely to win. but power wise, silvas punches or fedors could easily be as hard or harder than a boxers, skill wise boxers in hand department are betta but power and speed, that is natural.