Without knowing management, I'd take it with a grain of salt. Too many animals on stagnant pastures would lead to parasites. Most people don't practice good pasture management. If he sold out of a large boer herd and repopulated with a small herd of kikos, less land stress, less worms.

DEFINETELY worth looking into, though, as kikos are purported to have better worm resistance and vigor, and depending on your area you may be able to sell cross does as meat breeding stock.
Personally, I see Kikos as more a dam-influence breed, and boers more as a terminal sire. If you're planning on butchering the kids, I'd personally go boer. At worst you'd have to only maintain the more sensitive buck (if he is more sensitive) but you get growthier kids that should have enough hybrid vigor to keep them going well until butcher anyways, with proper management. The doelings could be sold as registered 50% boer kids - and depending on your area, they may be valuable. That being said, I'd love a dairy x kiko doe for a future meat herd (though preferably a medium bodied one. :P)
I had boers, and really really liked them. I secretly dream of a commercial herd (maybe someday... :P) with kiko X myotonic x dairy dams covered yearly by a boer buck. I'd also like to raise purebred breeding stock boers as well, too. Feet are another thing my boers all seemed like they needed improved, and I've seen pictures that say others have the problem too... never got very far with that before getting out of them, but food for thought if you have wet/mushy pastures especially.