That's a possibility yes. But it's not as if that's the only theory I have.... For example another one I came up with recently is about the Malnosso's robots. I think usually it's assumed they are somehow teleported inside the barrier. But I think there's a possibility they could actuallly be able to penetrate it. If that was true there might actually be a kind of metal or alien material that's capable of doing that.

So, if we could capture even the tiniest part of one of the robots, we could experiment with it and see if that theory is correct. Of course the problem would be even getting something like that to begin with...