Umm, it is written in every major buddhist text that Buddha placed kshtriya above Brahman in social order but what do you know about as you never had Verna system because you were Tribal people.
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more about the topic''
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1. “Buddha tells about the earlier Buddhas in the so called Mahapadana Suttanta – Great Sermon on the Legends.21 He refers to their membership of (high) caste as the first characteristic of their full enlightenment. According to this report the Buddhas belonged all to the high castes, to the kshatriyas and brahmanas. Buddha says proudly about himself “And now I, the venerable and fully enlightened one, was born a warrior and have come from the caste of warriors, o monks.”22
2.Your Boddhisatva can only belong to Brahman and Kshatriya
nstead, in perfect harmony with the Great Sermon, it was said that: “The Bodhisattvas appear only in two kinds of lineage, the one of the brahmanas and of the warriors (kshatriya).”26
3.According to Buddha, at his time the kshatriyas were above the now impure brahmanas. That is why, only a kshatriya can have the Buddha-ship. “Today the nobility has priority in the world, therefore the Bodhisattvas were born in a noble family.”28
http://www.chakranews.com/castes-in-buddhism-is-caste-only-a-hindu-problem-part-4/3094