I'll look at it from a UO-WSU perspective, which I'm most familiar with. Rono set his WR's in the summers of his college years, with the exception of the steeple, which was run at a meet in Seattle in April or May.
Chapa ran down and drilled Kimwoumbwa for the 1978 NCAA 5K title in Eugene.
Rono won three steeple titles and three X-C titles. WSU did not win an NCAA outdoor or X-C team title during this era. Oregon did, beating Kenyan-laden UTEP in '77 X-C team race. I didn't hear Salazar, Centrowitz, McChesney, Chapa, etc., complaining about the Kenyans. They just beat them.
Outside of Rono, Oregon's guys were pretty much right there or better than the other WSU foreigners. McChesney ran 13:14 in one of the summers of his collegiate years (though he never ran that while running in UO meets). Salazar beat Kimeto and I think Kimwoumbwa in a 5K in Eugene. Chapa's 3:38 1,500 was better than any Kenyan on the WSU roster.
I saw Jim Hill blow the Pac-10 field away in the conference 1,500 in Pullman. Hill also won a Pac-10 X-C title, I believe WSU had a Kenyan in the race. As noted earlier, Pre never lost to John Ngeno of Kenya/WSU.
If we put Matt Centrowitz, Jr., and Andrew Wheating on UO's teams of the late 70's/early 80's, not one WSU Kenyan could run their times.
If you put Rupp in the same time machine, he would lose to only Rono and beat the other Kenyans. And he'd be right there with Rono in the 10K.
The key isn't complaining about them, it's beating them, which has been done and can be done today.
Get tough, defeat them.