Potatoes are not particularly high on the satiety index (~33%). Brocolli and spinach are much higher at near 100%

https://public.tableau.com/app/profile/marty.kendall7139/viz...

I've been reading that what gives potatoes a satiety boost is that they contain proteinase inhibitors. These limit your appetite by disrupting your digestion. Maybe they are more effective as a weight loss food than the raw nutrition numbers would suggest, but for an athlete that wants to cut I don't think slowing your ability to digest amino acids is a good idea.