Why is Greco so unpredicatable? Are the rules too upset friendly? Is everyone equally good at gut wrenches and it's just a crap shoot every day? Is there so much depth internationally, or what?

It seems like every year, a guy like Marinov or Kiss just comes out of nowhere, wins a major title, and thens disappears from the medal stands . Meantwhile guys like Gaber and Kvirkvelia go from teching their way through the Olympics to losing early in every major tournament in a year or two. I just dont' get it. Hat the hell?