if you're one of the 100 or so Indians with at least 100 IQ and at least 5% european, why wouldn't you subjugate the billion other Indians
Steppe ancestry is not European (it's both Steppe and EEF). North Europeans are genetically the closest to the Steppe herders, we're over 50% Steppe and under 50% early european farmer. Some Northern Scandinavian individuals are on the fringes of the Steppe herder's genetic cluster.
Bronze age early corded ware culture was pretty dark and nordic features were just a minority. They had a cultural obsession with fair features, and selected for them. Later corded ware culture groups were much lighter than the early ones. And yes, they are racially the exact same people. 3/4 PIE and 1/4 EEF.
A branch migrated to central asia, eventually formed the Sintashta culture, who are proto-Aryans/Iranians. Nordic features were barely the majority. Then a branch became the Andronovo culture, nordic physical appearance was the majority. Blonde hair, then red hair was most common. These are the Aryans who started the early vedic period.
Aryans are inherently CWC-like. And CWC is inherently Aryan-like racially. They have some group differences from different selection pressures. Also, their average IQ was around the high 80s and low 90s. EEF was also dumb too with an IQ in the 90s similar to modern Sardinians (but nothing will ever come close to the impact the neolithic anatolian farmers had on civilization by literally starting it).
Yaghnobis, Tajiks and Pamiris have the highest Aryan ancestry in asia. Some white-pass, but they won't look like their ancestors in terms of physical shape, too much dissimilar foriegn admixture.
Either way, they should top dog in India's caste system.
Most Europeans and Jews are probably some of the few groups of people who are dramatically more intelligent than their iron age ancestors. Late antiquity and Middle ages had brutal, eugenic conditions (Thanks muzzies).
Ashkenazi's IQ is supposed to be in the 90s, but it's in the 110s. South Italians and Ashkenazi Jews have no sub-speciation differences. All of their group differences are just from selection pressure differences.
If you got rid of everyone except the white upper classes, our avg IQ would be 110+ as well. It's smarter to just do cooperative eugenics though, which entails average families assisting the far right side of the bell curve (not just in IQ) with reproduction.