Why Drive Away the Sun?

I've seen many ALL-tan stories end with Tanjiro leaving the Demon Slayer team and joining the Demon team. Why can't they cross crews? Demon Slayer: Kimetsu no Yaiba & JOJO mixed group have the same world view Modern & campus paro The Demon Slayer Team hates Tanjiro in the early stage and the Crematorium in the later stage. Tanjuro survives Tanjiro is the favorite of the JO group (no CP) The JO group has stand-ins and ripples Past and present stories OOC warning! ! !