It's one of the things that frustrate me in most UFC Heavyweight title bouts... the way Rogan (and others as well but mainly him) keep trying to hype the winner as "the baddest man of the planet". The UFC 155 promo consisted of little else.
There's a reason that throughout the history of boxing there are only really three heavyweight champions who you could really think of as a "baddest man on the planet" and only one of them really made the term his own... Liston, young Foreman and Tyson. It's not (just) about winning bouts and scoring knockouts... its the persona, the attitude, the aura... it's the fact that to this day people still say if Tyson hit the average man on the street he'd kill them with a single punch. It's the tension, the sense of barely contained anger and rage, the hint of maliciousness, the feeling that the guy is taking a savage pleasure not just in winning but in destroying his opponent.
But more than that it's not a title you "win". It's not something one announcer or even one PR company can give to someone (think how ludicrous it would feel for either of the Klits to give themselves that moniker). It's something that sort of just happens... it just gets accepted. You don't have two fighters face off to decide who gets the title...