This might be a whole new kettle of fish, but what you’ve just said about all the onscreen material about Rey’s parents has made me realise that it might have been originally intended to set up something else - that Ochi was sent to capture Rey’s dad (Palpatine’s son), not Rey. That’s why it’s the same ship, and why they had to abandon her on Jakku - she was likely secret from him at that time. Ochi ended up on Pasaana and died after having done whatever he did with Rey’s dad.