Chebet was fresh, Gudaf wasn't. I'd also point out the "doesn't have it when it matters most" Tsegay, in the Shadows of Faith and Sifan, has quietly built up a decent stash of medals. People forget she's still relatively young - 5 years younger than Sifan, only 3 years older than Chebet.
By 26 she already has:
2 x World Title
2 x World Silver
1 x World Bronze
1 x Olympic Bronze
1 x World Indoor Title.
Her range is *almost* Hassan level: 1:57/3:53/14:12/29:29.
Not sure how you can have 2-3 World titles and 5 global medals by 26 (Hassan had zero titles at 26) and not have it when it matters. I also feel obligated to point out that she has two more World titles than Sifan in the last two years and I'm not sure you can blame that on doubling - Sifan was nowhere last year and both were fresh for 10000m this year.