Just a small question?

https://preview.redd.it/28ci71mxegie1.png?width=545&format=png&auto=webp&s=52553635f8e32abaaf69558e485dc95032291b58 If you've ever seen a picture of scientist Nambi Narayan, he looks incredibly white and European when younger, but he says that he belongs to an OBC called Senaithalaivar. Can I just have some explanation regarding why he looks very white? BTW, just curious about it. I'm not trying to offend or glorify any caste because I myself am on the darker spectrum of skin tone.