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PHOENIX, AZ - JANUARY 15: BJ Penn enters the Octagon before facing Yair Rodriguez of Mexico in their featherweight bout during the UFC Fight Night event inside Talking Stick Resort Arena on January 15, 2017 in Phoenix, Arizona. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)

PHOENIX, AZ - JANUARY 15:  BJ Penn enters the Octagon before facing Yair Rodriguez of Mexico in their featherweight bout during the UFC Fight Night event inside Talking Stick Resort Arena on January 15, 2017 in Phoenix, Arizona. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)