I wasn't at all confident that Jones' legacy would surpass Anderson's at that point. The only meaningful fight for him in terms of legacy was a prime Ryan Bader, which isn't worth all that much. The way he won did tell me that he was a special fighter. But not any more than, say, Max Holloway's destruction of Cub Swanson.
Then he beat a couple of over-the-hill Pride champs, which is worthy of a solid champion in Jones' era, but not GOAT impressive.
The Machida win was spectacular and is the fight that really started putting him in the conversation imo. Machida was sharp, in his prime, and was very dangerous for Jones, who handled his tactics very well.
Then he had one mismatch and two joke fights against the precipitously declining trio of Rashad, Vitor, and Chael. Only the Rashad fight was worthy of supporting a GOAT legacy, and only barely.
The Gus fight sealed it for me (for what I hope are obvious reasons), so it was a further 6 fights beyond Shogun before I accepted him as being a GSP/Silva/Fedor-level guy, rather than just a top 15 all-time kind of guy.
And after Gus he fought a better version of Rampage (Glover), Cormier who is a super legit champ, OSP who was outmatched but phenomenally dangerous and at his absolute peak, and then the best performance of his career taking out Cormier the second time, which clearly blows away anybody else's resume, and may stand forever.