Dark_DustDragon, I'm completly agree with you, It's a excellent interpretation of Paradox's fusion with Sin Truth Dragon.
If you has an idea toward the movie, a character..., don't hesitate to post. The goal is to discuss and share points of views.

Your post gives me several ideas when you said about Paradox who "didn't go in the details".
Your post isn't crazy at all. An unavoidable fate of death for all...
It's a way to see things, It's a also philosophical point of view. Why
not after all? Toward the movie, the end of the world was caused by
something created by humans instead of 2012 and prophecies must be
caused by something impossible to stop. But I see your point: the world
is necessarily destroyed by something at final, caused by humans or not.
I wonder me also what is how the Duel Monster destroy the world. Paradox
said Duel Monsters had destroyed the world: I consider his sentence
like true, he has no reason to lie. Anyway, he revealed this to
protagonists in thinking he would have won. It isn't the case but now
Yusei, the others Signers, Yugi and Judai knows this and now they will
work all their existence to prevent this. It's very interesting, they
must fight a fate who seems inevitable because Paradox come from the
future.
The world destroyed by Synchro Monsters? Possible, Yliaster wants
destroy them after all. They use themselves monsters which nobody is a
Synchro Monster, implying Synchro Monsters had destroyed the world. In
the movie, in the trailer, it is said that Stardust Dragon will destroy
the world. Here, they're a problem. This implies he is the destructor of
the world. However, Paradox target only Stardust. Yliaster target all
Synchros Monsters to destroy them. However, they came from the same
future.
Where the possibility: Yliaster hasn't seen the world being destroyed,
but they knows a Synchro Monster had destroy the world. They can have
some vision of it: they said they can communicates with God. They don't
know what is this Synchro Monster, It's why they target all Synchros
Monsters. Paradox, he, has assisted himself to the destruction of world
by Stardust, explaining why he target it. Some events lead him to meet
Yusei. Because he is very shocked by his future like I said in my
previous post, he wants to be sure he would have save the world himself,
he estimates to act by himself is the only way to save the future. If
It's really the Stardust Dragon who had destroyed the world, It's very
ironical when I think at the name to his special ability: Victim
Sanctuary.
The word "sanctuary" in his special ability has always surprise me: why
sanctuary? I came to the idea that Yugi can have created himself
Stardust Dragon. In my opinion, Stardust bears a resemblance with
Osiris, Yugi saw it himself and If it think to the place where he has
beaten Atem, It's a sanctuary. And the word Victim can be explained by
the fact Yugi beat Atem and his feels his victory like a sadness, a
pain. In this point of view, he is a victim of the sanctuary.
After all, he had
saw (in the real sense of the word) the future,
the fact he can create Synchros Monsters (probably with Judai's help)
can make sense of this point of view. Your signature proves it also, It
is excellent, I like a lot.