The most obvious reason is that this direction would be a lot less exciting and Monoma doesn't hold any meaningful connection to All For One as a foil. The entirety of the story constructed Deku's ...

My Hero Academia has hit a new stress point in Deku’s struggle against Shigaraki as the young hero has been trying all kinds of new techniques and mix ups with One For All’s quirks to try and ...

Because Deku watched with the world as All Might carried superhero society ... the conflict when he deals the last blow, ...

Should the battle go south, almost none of the heroes present will be able to escape All For One’s wrath, and reinforcements will no longer be able to arrive as quickly as they did for Deku.

Chapter 317 of the series picks up after the explosive cliffhanger that saw Deku and the pro heroes caught in All For One’s trap. The pro heroes have thankfully all made it out alright ...