Might be it’s simply a case of Gunn digging the aesthetic of that S. Or like I said, given his use of KC art elsewhere, maybe that’s what he wants to work towards. Legacy seems like it will be an inversion of KC in terms of story, a young Superman showing up who rejects the ethos of his peers/elders and blazes a new path for a new age of heroes. Superman as the rebel suits Gunn more than Superman as the angry Boomer out to get the young punks off his lawn (that’s Waid’s schtick )