Because a del Toro movie is a del Toro movie, and you don’t want to try and hand a del Toro movie to someone else.
Hellboy creator Mike Mignola reveals that the reboot was originally tied to the first two films created by director Guillermo del Toro.
Shaking things up even more, screenwriter Andrew Cosby noted that the reboot would be “darker” and “more gruesome” than del Toro’s movies.
While Mignola appears disappointed that del Toro wasn’t able to complete his Hellboy trilogy, he seems pretty energized by the prospects that Marshall is bringing to the cinematic reinvention of the character.