[Mind-Blowing Theory] Could Nezuko Be The Key To Ending The Demon Threat?

Webdemon slayer's manga ending reveals the ultimate fates of tanjiro and nezuko, although some reading between the lines is necessary to get it all. Webhe easily overpowers tanjirou and tries to kill him. Luckily, genya finally reaches the two and tries to save his friend. Meanwhile, nezuko uses her blood demon. Webthis could be a key piece of evidence which can back an important fan theory that connects the blue spider lily and nezuko conquering the sun.