Kamado Tanjiro Vs Muzan Kibutsuji

What if Tanjiro learned the breath of the sun from his father and is stronger from the very start of the story?
What if Muzan Kibutsuji don't play around and just force order his uppermoons to destroy the demon slayer?

WARNING: Both are OP Characters.
Tanjiro Kamado: Sun Breathing and Strong swordmanship
Muzan Kibutsuji: "If your a threat he will immediately dispose of you before you even become a bigger obstacle for him"