That's just because we went bankrupt. Clearly you've never heard of the Cuban Missile Crisis or of the Rosenbergs.
klokov likely has a minimum of 24 months military service due to russian conscription
konstantinovs has no military service but is an experienced professional bodyguard
fights are not won simply by who has more experience fighting, there is a reason there are weight classes for mma and other combat sports
do you think an advanced 150lb fighter would win a fight against an intermediate 270lb fighter?
that video does not really hold relevance
i am more interested in examples from combat sports such as boxing and mma, although these are far removed from street fights you can know the skill level as well as weight of the fighters unlike in street fights, in the example you posted, the manlet could have been a far superior fighter, or he could have been an inferior fighter and just got a lucky hit in, there is no way of telling