Sukuna losing 10 shadows cause of mahoraga is bullshit btw
I'm thinking this is about usability
The other shadows were formed with agito,
Maho and agito are both destroyed.
Megumi can still use the switching or shadow appearing effect because of his domain expansion
Sukuna can't use megumis de
Also I'm feeling there's gonna be a shadow left for megumi whether it's divine dog or a totality with mahoraga
So sukuna would rather just use his shrine instead