I think its a bad idea, BJ Penn is a small light wieght, even smaller as a welter. GSP will run threw Penn, 1st round TKO or KO. allthough size really dont matter, GSP is better both on the ground & standing. Dynamic n Versatile he will dominate that fight hands down! U all will see, GSP is a forced to be reckoned with fighter, all the way to light heavy n under, he is way to athetic n well rounded for most fighters to handle. i think GSP would even beat Leyoto Machida in a light heavy bout. GSP has just the style for that illusive karate that machida is so good at.
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