Sentence Correction (SC) | In 1913, the largely self-taught Indian

In 1913, the largely self-taught Indian mathematician Srinivasa Ramanujan mailed 120 of his theorems to three different British mathematicians; only one, G. H. Hardy, recognized the brilliance of these theorems, but thanks to Hardy's recognition, Ramanujan was eventually elected to the Royal Society of London.

(A) only one, G. H. Hardy, recognized the brilliance of these theorems, but

why BUT is here. X recognized the brilliance of these theorems BUT thanks to X, Y was elected.
It doesn't seems
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