So the leaks have pretty much been confirmed to be fake? I think the plot of ROTB will likely be more low-key than the leaks are making it out to be. Crazy timeline altering time-travel stuff also got rumored for TLK, and that obviously didn't happen. Heck, people said the same stuff about Rise of Skywalker. I think most of the plot will revolve around the Beasts and fighting the Terrorcons. I do think Scourge is working for Unicron (mostly based on his faction symbol looking like Unicron's head), but it doesn't have to be via time-travel. And if it is, I think it will just be a quick vague line like "I was sent from the future by my master". I expect Unicron to be more of a tease than anything. I actually think the idea of starting the movie post-TLK then going back in time is a fun idea, but I don't see it happening. It just seems too crazy and confusing for general audiences. Especially all the supposed alternate dimension stuff.