Yeah, Usman's last 7 opponents are the only ones that can be described as 'Top Talent.' While each and every one of GSP's fights in the UFC... including his very first fight against Karo Parisyan... were against Top Talent.
That's 22 fights, 2 of which he lost and avenged, 16 title fights, winning the WW title twice and the MW title once.
I'm not saying Usman has a LONG way to surpassing GSP because even as GSP said the competition gets better and better, but, IMHO Usman needs a few more title defenses to have a convincing argument to be considered the GOAT WW Champ. GSP won the belt for a 2nd time in the rematch against Serra (unifying it, he won the interim belt in the 3rd match with Hughes) and defended it 9 times, so I'd say Usman needs a minimum 6 defenses before being in the WW GOAT discussion.
I will say that Usman KOing Masvidal - which no one has ever done before in 50+ MMA fights - is a big feather in his cap.