It's very true. Kejelcha a great example. Only when he was with Salazar did you see him chasing a great mile (with little monetary incentive) and he got 3:47.0 which really stands up.
It seems it's mostly the NN group (Cheptegei, Hassan, Gidey, Kamworor, Kipchoge) that will set up WR attempts for their athletes and arrange for perfectly organized TTs (recruiting top pacers like McSweyn, Kimeli etc.). And that's only when a World Record is prescribed. They manage Kejelcha, but he'll just race on the circuit as opposed to orchestrated Time Trials.
Kiplimo makes big money on the roads (and targets WRs) and jumps in European meets mostly for the paydays and qualifying marks. His 26:33 if anything seems almost accidental, he was in such great shape he just did it anyway. Aregawi appears to be operating the exact same way. Both are Rosa athletes, so it makes sense.
The Ethiopian trio of Barega, Girma and Wale run in top European meets. They basically decide if they want to go fast and even though they all have the same management, clearly they all want to beat each other and get the most money.
It is a really unique situation to have a fit Woody Kincaid pacing 7,400 of a 10,000 (for free) in an event that was delayed for weather.