@QuakingStar: As far as the manga is concerned, it has been explicitly stated that only Six Paths Chakra or, more effectively, Six Paths Senjutsu can do anything to the Limbo clone. Hence, as per the manga lore, we have no reason to expect Nagato or Obito to physically harm the Limbo clones. If you think otherwise, please state the facts and feats that support your statement. Madara being inferior to Hashirama in no way implies that Rinnegan Nagato and Rinnegan Obito would pose a threat to RINNEGAN Madara (not his weaker EMS version). Whatever you might think about Maddy, the fact is that in terms of natural abilities, he was the second-most powerful modern shinobi in the entire manga (before people started getting free upgrades). And that was EMS Madara. Rinnegan Madara would probably kick Hashi's ass.
P.S. Please don't mention Hiruzen. Not only is he featless, but even his hype was taken away from him in Shippuden. And as far as DB4's entry about Hiruzen is concerned, the only direct translation I could get my hands on merely stated that he "showed more talent than Tobirama at a young age". Also, I don't know of any source that claims that Tobirama=EMS Madara. Manga seems to imply that Tobirama was slightly below EMS Madara. No one bothered to mention Hiruzen when characters compared Madara's "legendary" power.