Nobody disputed that? Cut the BS
Fitch had only one ranked win at the moment of the fight, who was #5 Sánchez by SD. Add Alves who went into a great run after losing to Fitch, but that's the only actual tittle contender from that era that Fitch beat.
Okami had more credentials than that coming into his tittle fight
Silva finished the fight. GSP didnt.
Silva was at the peak of his reign coming off front kicking Belfort, while GSP had tapped to stroked to Serra not that long ago.
That's why Okami was regarded as less of a challenge than Fitch but it talks about Silva's greatness not Okami's being an inferior caliber of opponent, which he wasn't according to rankings, odds and credentials at the time of the fight.