Large catch dog 55+ lbs VS small catch dog 50 and below

I have some questions or food for thought. How do we really test a catch dog against boar? Do we release to a pig thats already surrounded and distracted by other dogs who will also pile on and get a hold when the catch dog hits. Have the other dogs already ran the pig a good ways and got it worn down, hot, etc now in comes the catch dog that we again run in behind and try to help out asap? Game pits I hear were faught for sometimes well over half an hour. These men exercised these dogs very well. The dogs were bred to produce better pups based on what, endurance, heart, tuffness/hardness and its ability to endure and win. I'm sure many other things went into breeding these game pits together in order to produce a better game pit for the next generation. Before the dog vs dog there was bear baiting and bull baiting. How were the dogs tested then against those animals. 1 on 1 both fresh or was it different? How long was the dog tested and these two animals allowed to fight one another back then.
Is what we do today with pits using them as catch dogs sending them in to a boar that's already worn down and distracted by 5 other dogs who are often times going to get a hold also once the catch dog does, then us running in behind the catch dog. In the pit, when dogs were faught against dog or against bear or bull, did the dog wear armor such as the protective vest we put on them today?
Having to do all this for the catch dog and breeding one like this to another, does it really further the breed along and make them better performers against such an advasary as the boar?
What would be breeding for a better dog? One that could hold a big boar 1 out for longer than other dogs. One that only needed a collar for protection against the tusks of a boar rather than full body armor and rarely in its entire life ever got injured or hurt vs one that was cut up all the time and was wearing much much more protection? One that has the size, structure, strength and endurance to hold 1 out for a long time and remain in controle of the situation for the entire time rather than a dog that just holds on and is a weight called an anchor, if the dog is even big enough to be considered an anchor and not just an ear ring. A dog that commands controle of almost any situation. The boar breaks, it has overwhelming speed against the boar and recaptures it instead of the prey being lost and in the hands of other dogs or to make good on its excape.
What is the better type and bred cd here for pigs. One that's just hard but can't perform its duties without the help of other dogs, is cut down often, can't controle much and people feel like they need to run in behind the catch dog and take controle of the situation in order to keep injuries to a minimum? Or is it a catch dog that needs no other dog to help it in any way, holds for much longer and in far less protection and lives its life with very very few injuries and is ready for work day after day after day.