XC3 spoilers

These are some of the questions I was left with

What is the deal with Lucky Seven. They start off by saying its just a special sword that can cut through anything but then they call it the Sword of the End(no one explains this or explains why they recognize it as such) and for some reason N has his own version of Lucky Seven too? Along with the same type of sheathe that Noah uses that for some reason has the Moebius symbol even before he becomes Moebius. Later on, Noah pulls out a sword in his Ouroboros form that people call the Sword of Origin(again, no one explains what this means) and when you fight N again in Origin, his Lucky Seven is replaced by another Sword of Origin??

In the City its brought up how Mio resembles the founder with cat ears and how Noah resembles the first Vandham who has a passing resemblance to Fei Fong Wong but nothing comes out of this seemingly important information

Melia says that she knows the current situation because she can see whatever her robot replacement sees. Why would Moebius set it up so that she could do that? Melia says that Z is the cumulation of everyone's fears regarding the worlds merging but from the beginning cutscene of the game we can see that the general populace had no idea the worlds were going to merge and were going about life as usual.

Z says that he wants to maintain the endless now but constant fighting in war was not the state either world was in before the merger. Later on he says that actually Moebius want to be entertained by the events of the world but then after the fight he seethes and goes I HATE THIS WORLD?? As if he's not the one who made it this way.

In N's flashbacks Z can just kill people and delete weapons on the spot without lifting a finger for some reason. Towards the end, Taion says that the reason their group got this far is not because they're Ouroboros but because this specific group of people became Ouroboros. This isn't true though, in N's flashback where he and M ran away from their team, we can hear the voices of the current Ouroboros group implying its the same group every time.

Speaking of M, what's up with her? Her bodyswap plan was her way of telling N that she did not agree with their current life and ways, why didn't she just use her words instead? She is one of the strongest people in the world, surely she isn't scared of fighting N if words don't work and we know she isn't afraid of death either.

Finally, at the end of the game Noah throws Lucky Seven into the ocean, why does he do this and why would he do it when he can just summon it any time he wants?