The last time we saw B.J. Penn, he was on the receiving end of a beatdown courtesy of Rory MacDonald at UFC on Fox 5 this past December.

It was Penn's fourth straight fight as a welterweight, where he has gone 1-2-1 since dropping his lightweight title (and the subsequent rematch) to Frankie Edgar back in 2010.

Many of his critics have felt that if Penn ever does fight again, he should at least return to the division where he's had his most success which is 155 pounds.

"The Prodigy" contemplated the move earlier today, debating the pros and cons of fighting at lightweight on his Facebook page.

‎"155? first I gotta spar and check my depth perception, LW's will eat me up with their speed if I don't judge the distance right, no weight class is easier"

The depth perception Penn is referring to likely related to the cataract he has in one of his eyes, which is going to require surgery if he ever wants his vision fully repaired.

As the former champion mentioned, speed could also be an issue. The lighter, sleeker Penn has been outpaced by bigger, stronger welterweights in his last two bouts. Dropping down a weight class won't suddenly give him turbo boosters either.

If Penn were to return to the Octagon, what weight class would be best for the 27 fight veteran?