Chief Justice at time of initiation of Brown Case, Vinson, died, and replaced by Earl Warren,

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who then insisted on unanimous decision.

(Due to statement of Thaddeus Stevens on Equal Protection.) 'Whatever law punishes a white man for a crime shall punish the black man precisely in the same way and to the same degree. Whatever law protects the white man shall afford “equal” protection to the black man. Whatever means of redress is afforded to one shall be afforded to all.'

https://constitutioncenter.org/education/classroom-resource-library/classroom/12.5-primary-source-thaddeus-stevens-speech-introducing-the-fourteenth-amendment-1866#:~:text=Whatever%20law%20punishes%20a%20white,shall%20be%20afforded%20to%20all.