@Bruce_Butterfield, a bigger man has all of the added musculature including strength to support his frame relative to a smaller man so respectfully, the 50 lb comment doesn't fly. As a poor example, I weigh 165 and I road bike with a guy my age who is 2 inches taller but 20 lbs heavier and in the same shape as I am. He can hold his own even on the hills because his legs are simply as strong as mine pound for pound. So if we were in gym he could squat more than I.
And with respect to agility or coordination and speaking of biking, that in my opinion may be the only sport that requires less agility or coordination than waterskiing in terms of overall movement. The best skiers move very very little from ball to ball. The only noticeable movement to a lay person would be the arm we reach with. The rest are subtleties like timing. Yes, there are slight physical factors but isolating those would be the point of levelling the field by removing the reach advantage which is significant and frankly unfair. That's why jockeys have to ride at the same weight, to remove an obvious unfair advantage. Height and reach in our sport is a glaring advantage.
As proof of how unfair it is, consider how many more times that Chris Parrish has run 39 and 41 off compared to Terry Winter and yet, like Horton, many other ballers would agree that Terry is technically as good or better than Chris. If what you propose were true, Terry would be matching Chris on his passes but we all know it's really the reach handicap, don't we?