As anyone who has read my posts know, I believe that multiple characters from 400 years ago, including, Echidna, Pandora, and Satella, are guiding the world to a specific path in which Natsuki Subaru frees the world from its cycle of being destroyed and reconstructed by the seemingly endless iterations of the selfish hero who chooses his lover over the world with the Seal in Elior Forest or the equivalent of that being opened, leading to the world’s destruction. For more on that theory, read this:
Regulus specifically stated in Episode 51 that fate would have him meet the Emilia camp again. This info explicitly shows that Regulus’s Gospel made him believe that they would meet again despite it taking until the 4th loop for it to actually happen. This shows, as I have long proposed, that the Witch Cult Gospels are meant to keep the world on a particular path rather than being texts that give real forecasts about the future.
If you’ve seen Sen’yoku no Sigrdrifa, Vivy: Fluorite Eye’s Song, and Isekai Suicide Squad, Tappei’s other anime works, a common element of all those series is that in some or way or another, there was a force controlling or influencing opposing sides with Odin directing both the Pillars and the Valkyries, the collective hivemind Archive both giving advanced tech to Vivy’s enemies and also limiting humanity’s advancement of AI to prevent too much divergence from the future from the timeline it left, partially due to a rogue part of Archive wanting Vivy to succeed, and The Joker playing both sides, the Empire and the Kingdom, partially to make sure his lover, Harley, enjoys her time in the isekai world and to further his own agenda.
Thus, I believe it is likely in Re:Zero based on past precedent that there is a whole faction, not just one entity like those other shows, likely including Pandora, Satella, and Echidna, all hoping to push the world towards a specific future since Re:Zero is meant to be a more epic story compared to Tappei’s other works. Tappei might even be constructing these other anime works in the manner he did to give a hint to Re:Zero fans rather than simply reusing a similar concept due to laziness.