I would understand if Naruto made one comment about how Madara managed to break out of it, but I guess not, it just seems like Kishi forgot about it. Also how did Madara reattach himself so easily?
I'm curious as to whether he has a limited number of shadow's at his disposal like the six paths or if he's unlimited. It looks like they're just invisible shadow clones that are much more durable than regular shadow clones