It seems hard to believe this Mallow guy is somehow going to get from where he is now to where they saw him in their visions of the future. I’m sure they will avert this crises so we will never find out what that timeline would have looked like anyway. We are inching closer to these stories colliding. The Empires story is now extended by this general taking a trip to the Foundation so at least the Empire and Foundation stories will collide soon.
Based on what we have seen I can’t see how the Foundation can put up any kind of resistance. As for the 2nd Foundation I suppose Gaal is going to go there now and found it with new Hari? Is the 1st Foundation just a kind of ruse to hide the real 2nd Foundation? Kind of like an encrypted container inside another one to make you think you’ve unlocked its secrets?