If you think back to Yavin (another gas giant) it was further away than the one seen in this mockup and filled a large section of both the sky on Yavin IV and the space battle in ANH (even more so with ANH:R).

If the planet were to be that close in ROTJ it would take up most of the sky on the forest moon (not so much a problem as most of the time the trees block the skyline but it would mean night would be almost as bright as day bathed in reflected light from the planet and the new metal moon). And it would be a very dominant feature of the space battle (which already has a lot going on).

If it was moved back a bit so it seemed relatively smaller it could still be in the sky and in the space battle but not so much so that you can see very little else.

Some of our local gas giants have rocky moons that aren't right on top of their parent planets.