Online versions: https://www.eapoe.org/works/tales/metzngna.htm
Seems to me that the Berlitzferling eventually triumphs over the Metzengerstein at the end, despite what the prophecy states.
Yes, for me the prophecy and the outcome weren't very clear also.
I reread Poe stories now and again, but I hadn't reread this one, so it was nice to read it again. It's not one of my favorites, though, which are the longer ones with the protagonists going insane ;-) (though I love Arthur Gordon Pym also.)
I found the bit about the horse from the tapestry stretching its neck and looking at Frederic, very haunting in a nice M.R. James sort of way. It was also why I thought the horse was the missing piece and 'animated' the fledged horse to at last throw Frederic in the fire. But I'm not sure how to read all things that happened.
Yes, I agree. Though perhaps only in a revenge sort of way where he's still lost everything, too.