Well, he IS the best SF they've had in, like, 15 years. Doesn't seem unreasonable.
Some guy named Emanuel Ginobili disagrees strongly with you.
Some guys that have watched the NBA for the last decade know that Manny's a SG. (Also does local commercials for Comcast. His agent should get him some Rogaine endorsements, too, but so far, no...). Some of those guys that watched the NBA for the last decade remember some Bruce Bowen guy. Yeah, he was the SF. Defended well, but was told to go stand in a corner (like a kid with potty mouth) on offense because he couldn't do anything besides hit wide-open spot-up corner 3's.