Hadn’t considered the hyperfuel plot, but you’re right 😃

I am going back and forth between two ideas. The first is in the crawl above, where the fleet’s origin is explained as the old Empire just having deep pockets. This attempts to explain why Canto Bight is in the film, as a further exploration of that theme.

The other idea I had was to use that space in the crawl to explain why the First Order was able to surprise the New Republic fleet, so I’d say that the First Order used its spy network to locate the fleet for the first attack. This would set up the theme of there possibly being a spy on the Raddus, which is later revealed to be a partial red-herring when the Hyperspace tracking plot comes into view.