GSP :
- Only 2 fights in the UFC, then offered a title shot that he lost.
- Only had to make 4 fights for another title shot that he immediately lost against a former LW.
Kamaru :
- Had to wait being 9-0 in the UFC to get a title shot.
Well yeah, in the early days you'd get a title shot much quicker, since there weren't many great fighters in the UFC (LW was the only weight class in which PRIDE was arguably not as strong as the UFC).
It's not exactly a secret. I know that you already know all that, but in case someone reads this thread and wonders what's up, might as well give a little explanation:
In the same era,
Anderson Silva got his TS after winning
one single fight against Chris Leben.
Rampage Jackson got his TS after beating Marvin Eastman, that the UFC brought back just because Quinton needed to beat someone, and since the Beastman had an old win over Jackson (in his first fight ever) it was good publicity.
Rich "Ace" Franklin only needed to win 2 UFC fights before getting a TS against Evan Tanner
Plus, Rampage vs Eastman had already been booked in WFA as the first fight of the
"Rampage Rematches Whoop-Ass Tour"
Sadly the whole WFA 5 event was cancelled, which sucks since there were plenty of cool fights like it like Carlos Condit vs Pelé, Machida vs Alex "The Brazilian Killa" Stiebling, Pedro Rizzo vs Heath Herring, Urijah Faber vs Fabio Mello, etc etc...
One of my "favorite" deleted cards, it wasn't on the level of the soul crushing
Affliction 3 but it still stung.
ANYWAY 
In the modern days you have to win much more, especially if, like Usman, you're perceived as being another boring wrestler who only wins decisions (he even won his friggin' TUF fights via decision)
We would have to wait for the PRIDE/UFC merging for title shots to take longer to get, unless you were coming from another big promotion with their belt and were on a crazy run, like Strikeforce champ Jake Shields, who still had to fight a title eliminator against Martin Kampmann to get his shot at GSP (despite being on an insane winning streak against all the elites not currently in the UFC)
Usman: loses his title, gets an immediate rematch, and despite losing it again, gets a title eliminator next (whoever wins the Kamaru/Chimaev fight gets dibs on poaching Sean's belt)
GSP: loses first TS against former WW GOAT Matt Hughes, and needs to beat the likes of Sean Sherk, BJ Penn, Mayhem Miller and Frank Trigg to get another title shot...
When he lost it against Matt Serra, he had to beat elites like Matt Hughes & Kos to get another title shot while Matt Serra was sitting on his ass enjoying his belt for an entire year without defending (ok, he was nursing a back injury, but still).
It's obvious that GSP didn't have it easy in the UFC, since he wasn't a Dana bootlicker and constantly pushed for stricter drug testing, which didn't give him the same Dana White privilege as Anderson Silva, BJ Penn, Jon Jones, Chuck Liddell or Brock Lesnar..
Dana can be so damn petty when he's mad at you, even his loyalists aren't safe if they step out of line just once, as Anderson quickly learned when he had some shitty performances against Maia (and Leites to a lesser degree)
Anyway, I used to be conflicted against Kamaru Usman because I actually really like the dude, I didn't really care one way or the other before his title shot, but his performance against Woodley made me a fan (I couldn't stand T-Wood) and his reign was fun...

I didn't even mind the second Masvidal fight since it was only 2 months after the Burns fight

and he'd rematch Colby 6 months after
My problem was that had he kept on winning, he might has surpassed GSP's reign, and that could not be allowed to happen. 2 losses to Leon back-to-back took care of that, fortunately

I hope Kamaru can destroy Chimaev, and then go one to immediately poach the belt from Strickland and beat him worse than before (I'm thankful to Sean for beating the brakes of Izzy, but Usman should wreck him again)
WAR USMAN
Between him and Ngannou, the 2 African underdogs have a lot on their plates this week!
(can't believe Fury vs Ngannou is only a week away, dis gun be gud
)