Keep in mind the context here is the line "they all looked vulnerable and built their image gradually," so Reyes and Santos for sure are irrelevant here. Vitor had one deep armbar attempt and was otherwise trounced (and ultimately finished). Machida had a couple of good punches that surprised Jones but didn't ever put the outcome of the fight in doubt. Gus 1 was Jones's seventh title fight, and DC 2 was Jones's tenth, so again, neither of those are examples of early vulnerability that was forgotten as Jones's resume strengthened.
With all that as context, pull back for a second and realize just how thoroughly dominant Jones has always been. It's at the point that when he's "only" 50-45ing fighters (like OSP) or someone gets a submission ATTEMPT on him (Vitor) that people think he's vulnerable. How crazy is that? These aren't losses; they're not even close fights. They're instances of the opponent having a single good moment in a 25-minute fight. If that's the worst your critics can say about your performance, you're doing alright.