Dexter Jackson will be easily forgotten once retired.
Doubtful.
He's a former Mr. Olympia. Every time they do that roll call, citing the Olympia winners, Dex will be among the ranks. He did what few (if any) thought he could do, what Wheeler, Levrone, Labrada, Ray, Gaspari, and Makaawy couldn't do. He won the big one.
With that said, I don't think it's right that the aforementioned multple-time runners-up get more press than guys who've won the Olympia just once (i.e. Dickerson, Bannout, and presently Jackson; I'm not counting Heath just yet).