Main reason I thought Home One was already en route to Tatooine was because that was how the story group tried to justify why the Tantive IV was docked in it at Scariff (when Bail requested Leia to go off to Tatooine before Rogue One went to Scariff), but it would make sense for them to be waiting and supplying when they decided to redirect.

Personally, if they had to have C-3PO do a speaking cameo (I agree with most of you that a visual cameo on the ship would’ve done better, them on Yavin seemed somewhat forced), I would’ve placed it around Eadu, or something.

“Eadu? Why are we sending ships there, of all places?”