5 defenses at LHW > 10 defenses at MW
Rashad, Machida, Shogun, Rampage in a row > Anything anderson has done in his career
You know when your best opponents are guys comming off losses (Forrest, Henderson) or guys with no top wins at MW (Vitor) or guys with more than 10 losses and no major accomplishments (Sonnen) it says a lot about your level of opposition.
Anderson has made a career out of beating mid tier opponents, and he has more low tier fighters in his UFC resume than he has world class. He might be the more decorated fighter, but when looking closer it's beyond obvious his record is padded.
Not to mention Jones is the better fighter. While Anderson gets beaten up by one dimensional wrestlers, Jones is treating elite fighters like kids. While Anderson gets outruck by wrestlers, Jones drops elite strikers, while Anderson clowns guys like Bonnar, Okami, etc. Jones clowns guys like Shogun, Rampage and Rashad.
Anderson is great and all, but competition matters. Being the greatest of a weak division can't take you that far. Not testing himself in deep waters will forever hurt his legacy.