You dont know much about wrestling, and havent been in many fights i see
Wrestling classes come in many weights, the kid that was top 5 in the state at 155/167 or even 138 may be 225 pounds in his mid 20s and retain very good skills. Wrestlers have a huge edge in most any fight.
I have had my fair share of scraps, prob more then most, but how many fights I have been in really doesn't matter. My father threw me in a boxing gym at an early age, ( not claiming to be an elite, or even above average at it mind you.) My involvement in the sport has been a life long hobby of mine.
With the current popularity of MMA, alot of MMA gyms have popped up all over the place, additionally they often come to our gym to work on their striking skills.
I have seen plenty of former "state champs" and most can't cut it in the boxing ring OR in a UFC style of situation. I see glaring physical limitations, as well as the inability to not revert back to the highschool/college style of wrestling, aka leading with their head WIDE open because they are not used to having to protect it. So I am just calling it the way I see it.
So in my opinion your misinformed assumption is weak at best.
But if we are to compare apples and apples, take a top 5 all state wrestler against a top amatuer boxer what gives the wrestler an advantage in most situations, becomes their weakness.
If you have a fundamental understanding of the mechanics of a "knockout" it should not be difficult to understand why, expecially in a " no rules, anything goes " situation.
In boxing and MMA for that matter there are certain parts of the body that are "off limits" to strikes, elbows, knees, etc...remove the rules anyone matched up with a good boxer/striker that tries to go to the ground, will go to the ground alright..but by themselves.