Jenny is better at peaking than most of her competitors. Might he the key difference. Perhaps more runners are like Alan Webb than we think --per Gault's recent article --and aren't confident in their speed unless they have a fast time under their belt leading to the key race. Jenny might be more confident and patient than average and that might make all the difference.
I do think that if for whatever reason the world champs came down to a single Time Trial, she'd do better at it than her times suggest. I think we never see such things from her because the day she's capable of doing it, she is running another round.
Faith Kipyegon is just even better and more patient though, it seems.