BJ Penn. This is a rhetorical question broskie.
Like John Danaher said: "It's hard to get out of bed when you've got millions of dollars in your bank account and you have to go to the gym where people want to punch your head out."
That's what made GSP vs Penn II so intriguing. You have a kid who got bullied throughout school, grew up in the coldest environment. Poor family, hard working parents and child. Went to school for Kin and working as a garbage man. An elite athlete and fighter through hard work.
Then you have BJ Penn. He fought kids on the streets for fun. Lived in the warmest environment. Has sandy beaches, wealth, food, women, INSANE TALENT, had the warrior spirit, but lacked motivation to make his dreams come to fruition.