I WAS WRONG!!! I think your logic proved to be even worse than Naruto's.
As of now, my understanding is that at least there are 2 Severswords exist, 1 with Kakashi and 1 in the Samurai's or TSA's raided items. The Great and the Twins swords obviously only exist 1 piece each. The other 4 swords will depend on how Kishi wanted it to be. And you want to see 2 sets of the sword at the same time, what is the chances are for that to happened? Are you nuts? You will only see that happened if Kishi show us Suigetsu finally find his Seversword or someone from TSA decided to use it and take it out of the storage.
You have not seen Sasuke's new eyes and Itachi's together but why you stopped your previous arguments that the eyes of the summoned Itachi were the vessels' eyes? Are you believing that there are 2 pair of Itachi's eyes exist as of now?
Itachi uses his left eye for Tsukuyomi, he used his right eye for Amaterasu, he used both eyes to perform Susanoo. Here are something I copied from
You must be registered for see links
read it carefully. "As a member of the Uchiha clan, Sasuke possesses the Sharingan, the clan's Kekkei Genkai. It first developed during Itachi's departure from Konoha after the Uchiha clan massacre, with one tomoe in each eye, but Sasuke would later forget he had activated the Sharingan due to being traumatized by the incident. He was able to reactivate it for the first time during the battle with Haku on the Great Naruto Bridge, where he had one tomoe in his left eye, and two in his right. By the time of his fight with Rock Lee it had matured into two tomoe in each eye. It eventually reached completion, with three tomoe in each eye, during his battle with Naruto at the Valley of the End near the end of Part I." and these from the same link above "Unlike Itachi, Sasuke's Amaterasu comes from his left eye, and his genjutsu comes from his right eye, along with his ability to manipulate and extinguish the black flames." What was your question again? Obviously Itachi and Sasuke could activate and deactivate only 1 eye at will.
Let's see how your logic work for a change.
How about you explain what happened in these events? If you can't explain why you believe your arguments are true and convince US that you are correct then I suggest YOU STFU!!!
1. How the summoned Zabusa got his sword?
2. How the summoned Hanzo got his chained sickle?
3. Why Madara implant Itachi's eyes to Sasuke if it has lost its light?