You do make a good point about the Summoning Creatures but alas that too could be Madara's doing but I feel like I am starting to get repetiitive and Ill even admit to how unlikely that may be.I plan for this to be my last post on the matter as this has become stale for me.
1) Exaggerating? Perhaps, but I feel I have now found conclusive evidence that the Black rods are a rinnegan trait:
You must be registered for see images
You must be registered for see images
You must be registered for see images
You must be registered for see images
Now can you logically say that on top of everything Madara did, he also was able to summon all these creatures individually, create enormous black rods for each for each of them and implant them all with these rods? I find this extremely unlikely. I don't even think Nagato did this.
We have come to accept these summons as simply part of the Rinnegan. I think its very logical to assume that the rods in these summons were always there and that these summons are exclusive to the rinnegan, essentially creations made by the SO6P with the outer path. Can you really deny that these Summons are a trait of the Rinnegan and therefore, by definition, the rods implanted in them are direct traits of the Rinnegan?
3&4) I find it increasingly ironic that you keep using the anime image when we can't trust anime as far as we can spit on it. The manga page is far more conclusive:
You must be registered for see images
The manga shows much closer to half the body missing than the anime shows. Not to mention just before the image is shown, MADARA STATES THAT HE STUCK A HASHIRAMA BODY TO HIM. This directly implies the image following his explanation is the body he used in question to stick to Obito. I'm done arguing this point, you can deny it all you like, but 90% of the base would agree with me on this I'm sure.
Unfortunately for you, there is no way for you to prove that Spiral only formed after Obito got there. We never saw the tree before Obito was rescued, so there is no way to tell when Spiral formed. I, however, think its clear that all the Zetsu forming on the tree once Obito got there, had been forming before Obito ever came into the picture.
But I do agree with your point, this is getting stale. Like I said earlier we are too people looking at the same scan and critisizing the other for not seeing what we are seeing. But to me there is no way that half of that Zetsu's body is gone. I used the Anime because it better illustrated my point but if you just look at the shadows there is a depth shadow on the upper body on the Zetsu's left side, which indicates that the entire chest is still intact, including part of its shoulders.
Then there would be no reason for it to be sealed within Spiral Zetsu.-i believe the spiral zetsu can not manipulate all 5 elements...its hashirama's budha summining that produced it...the spiral zetsu might be strong but he isn't that powerfull to controlll the buda summoning...not even some1 like minato is able to controll it....but uchiha madara could....there has to be some1 inside spiral zetsu..i believe its the empty shell of uchiha madara sealed within obito......in other words the 2nd madara controlled both spiral zetsu and obito who were in the same body of obito...
The question isnt whether they could control the rods, the question is whether they can create them. Obito was never able to create black rods.Yeah, the black rods are an expression of chakra its not just from the Mazo. We have seen Madara produce them from his body, they are his will made manifest it seems to be something only the Rinnegan can do. Madara gifted the rods to OBITO for when he used Rikudo jutsu, IE six paths technique which he used early in the war.
Nagato however could use his own manifested rods. Giving Nagato Madara's Rods wouldn't accomplish anything, even if Nagato had Madara's Rinnegan it was Nagato' chakra that needed to move the puppets of the six paths. Hence Madara made black rods would be useless to him.
Obito could use these black rods because they were made using the Mazo not with Madara's chakra. Yes they contained Madara's will but they likely as Fear said reflected Obito's chakra hence why Obito could use them.
Obito could only create black rods it seems after he became Juubi Jin for a time. We have never seen him produce black rods before that point.
The reason Nagato could create them is likely his life long experience with the Rinnegan and little else.