Your conclusion is full of holes. They are not immune to Naruto's attacks or his rods, they were injured by those things, and it didn't slow them down at all, nor does pain affect them. That had nothing to do with their immunity, their immunity prevents normal attacks from touching them at all. And no, they would not be easy enough to kill. They can take a hit from one of the strongest characters in the entire series and shrug it off, they are not getting taken out, easy enough. Also no, there was never any indication that the limbo clones transfer damage to the original, that was a wrongful assumption made by the wiki team, there was never any sign that that was the case, if it was Madara would've had an abrasion on his arm after the clone took a hit and he would've shown marks from the limbo clone being impaled by rods during the sealing.
I haven't the slightest idea where you get the notion that a massive katon can kill a limbo clone, do you not understand that they are at least as durable as Madara himself is and possibly faster considering just one of them seemed to hit all nine bijuu almost simultaneously. Nothing short of an attack that would kill the original Madara would overcome the original Madara's durability would take out a limbo clone, so unless you are a top tier character, you're not doing anything to them, and even if you do, the real Madara isn't getting harmed by association. As far as the chakra disruption, I have lost all respect for anything you have to say because you actually equate what black zetsu did with being the same as putting him under genjutsu, it's not even remotely close. There's the fact that black zetsu is one of the oldest characters in the entire series and a direct extension of Kaguya with capabilities completely unknown and who used a process to seize Madara's body that we known absolutely nothing about the mechanics of. Aside from that there is one character in the entire series that is maybe capable of putting Madara under genjutsu, and even then there is no evidence that that would get rid of the clones.
Then the root of the matter, you keep wanting to talk as if the clones are fodder which leads me to believe that you have no interest in discussing this logically and just have something against the idea of Madara as a character having this power. Those clones are Exact duplicates of Madara that are restricted to melee, which based on what we've seen is more powerful melee than the original is capable of. Not to mention when they are injured they don't disperse. There is nothing, anyone below top-tier in Naruto that is just going to shrug off even an assault by a single limbo clone, let alone multiples. You would be lucky to even get off one of those indiscriminate attacks before they kill you with what will most likely be a single blow if you don't have the durability of a demi-god.
