Did Gautama Buddha endorse the caste system?
Hans Wolfgang Schumann has statistically proven that almost all of Buddha's disciples were high caste people and that the Brahmans comprised the majority of the Sangha.
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 Brahmans. 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 the warriors, O monks.
21 Buddha - Die Lehre des Erhabenen. Aus dem Pali Kanon ausgewählt und übertragen von Paul Dahlke, München 1960.
The Bodhisattvas appear only in two kinds of lineage, the one of the Brahmanas and of the warriors (Kshatriya).
So my question is, did the Buddha endorse or uphold the Vedic caste system?