That looks fun :) Although from what I can see from a little Googling, these guys might be more street-fighters than MMA players. Some cross-over, I'm sure. My Polish isn't good enough to tell.

I'd like to see what difference some decent strategic training would make in those fights.

There are quite a few team combat fights on YouTube now, often staged in Poland and Russia, from what I can see. Most seem to be groups of one-v-one, rather than mass melée.