Jose Aldo is undeniably one of the greatest fighters on the planet.
While approaching his superfight with Frankie Edgar at UFC 156 this Saturday night, Aldo sports a 21-1 MMA record and five straight featherweight title defenses.
But this is a superfight, folks. And even with a resume as strong as Aldo's, he has reason to worry.
Edgar is no joke. He was an undersized champion at lightweight, and he hasn't been dominated since he suffered the first loss of his MMA career against Gray Maynard in 2008.
So what does Edgar offer that will keep Aldo up late at night? What questions do fans have for Aldo as he preps to defend his title for a sixth time?