The Two Interesting Ideas in Craig's Question

If there is another universe and it's leaking into ours, then there's like overlap. I would say that things in another universe are things you cannot interact with. But we can still somehow interact with them. And so if we're interacting with this stuff, if we're feeling its gravity, then it's in our universe. The other idea which you bring up is like maybe there's another universe that gravity can somehow interact withlike maybe there is other matter. If it were in our space, we would see it right? It's sort of normalish matter but not connected to our space yet.