They all had destructive abilities which was fostered by very brutal training. Fighting and brutalizing eachother while their bodies had to endure training camps(For guys like Cain, very foolish ones) it's not a surprise that they tanked pretty fast.Diverticulitis did more than the “new breed”, which tanked pretty fast itself
This is not a joke sport like Boxing, a pathetic 'duck eachother for years, beating cans in order to marinate a superfight once they're over the hill'. These guys wasted no time destroying eachother.