So, I just completed the Demon Slayer Anime until its current season( never read the managa). I am very confused at the dact that Nezuko was able ro conquer sun but not Muzan.

Tamayo states that Nezuko is prioritising something else over intelligence and in future will conquer sun.

But if Nezuko can potentially prioritise her mutation for sun protection, why Muzan cannot who is the original, has been aliver longer, has much more power , control, knowledge , has done lot of expirements etc. is there any special ability with Nezuko?

Is this explained later? I am okay with spoilers.