I think Fantasy is quite different in that regard. In it, only the Lizardmen are truely aware of and controlled by the Old Ones. The races of the world were all created to battle the foretold Chaos invasion, but each race lacked in some regard. The Slann only took over later when the Old Ones were already gone, left with only their 'bodyguard' race. Iirc the Ogres would have been the last race created and also been the one to destroy Chaos ... if they were completed before the Invasion. In the end they turned out as .. well, Ogres.