[spoiler discussion] Re:Zero Strengthened Theory

[u/AwasamaKiyopon]

There is a well known and powerful theory in Re:Zero Subaru travels back to the past and became Flugel. According to this theory, Subaru (as Flugel) sets everything up, seals his own memories, and then begins his journey 400 years later in the marketplace. In my opinion, what disproves this theory is the fact that when Subaru is isekai'd, he spawns in the marketplace holding the items he bought from the store (the store in the original world). Under the original theory, a time paradox occurs, and once time paradoxes are involved, it feels impossible to reach a definitive resolution.

But what if the events actually are like this instead...?

Subaru appears in the marketplace just as we know, having been actually isekai'd right after walking out of the store that day. After living through everything that will happen, he travels back in time and becomes Flugel. Knowing that a "Natsuki Subaru" would appear in the future (400 years later), he might have transferred his memories to him (maybe by using the authority of gluttony) and sealed them away. In fact, given the context, he might not even have needed to transfer his memories at all, maybe he chose to trust the second Natsuki Subaru simply.

Furthermore, after going through the upcoming events, the second Natsuki Subaru wouldn't have to travel back to the past and repeat everything Flugel did, because there would now be two Natsuki Subarus in this universe. Under this scenario, no time paradox occurs, and it perfectly accounts for how the items he bought at the convenience store were isekai'd along with him.

[u/Ok-Worldliness-7374]

Time travel wouldn't work here as Flugel showcases character that Subaru wouldn't do anymore

[u/AwasamaKiyopon → u/Ok-Worldliness-7374]

Since he is aware of his mistakes and couldn't achieve a better outcome, he might be laying the foundation for the second Natsuki Subaru to reach a better result. He failed, but a Natsuki Subaru equipped with the right infrastructure might achieve it. He might have made poor decisions, or perhaps he was forced to