He'd be a clear favorite over all 3. Colby and Woodley are tailor made for him. T-wood struggles against people that pressure, through the jab and can single/double leg him if he attempts to explode. While T-wood is incredibly talented, his holes are pretty clear for a guy like GSP to expose. Colby would get taken down and simply doesn't have the stand up to deal with GSP. Usman is the best match up, he's tough, durable, great gas tank and transitions his take down offence incredibly well. That being said, George knows how to make the pressure boxer/wrestlers struggle. His wrestling is in my opinion the best we have ever seen against pressure fighters, he makes you pay for the slightest of mistakes. Georges stand up game is just better then Usmans, Usman could land something, but he's not really some crazy power puncher and George's Jab would once again create issues for Usman