If you watch the making of MOS, they said that MOS was influenced by the Nolanverse. It was supposed to be a Superman in the real world, and how the people react to an alien, as well how an alien fits in on earth. So it would fit perfectly in the Nolanverse, because even in BvS, the arrival of Sups changed things, it changed Batman, made him more ruthless, so that fits with a Baleman that doesn't believe in killing. That change would mean more if done with Bale because of the trilogy/history, as opposed to a brand new Batman that we've been TOLD has a 20 year history, but we've never seen it.