The planet called Sakar seems like something Disney could make to be similar to Galaxy's Edge in a theme park. The fact that one of the characters said that 'time works funny here' or something similar to that could allow for a wide range of characters that could appear in a theme park that guests are supposed to imagine is part of Sakar. You could even have characters that were in the movies and whose death might have been questionable to appear there. They could also live there for a long time regardless of when they arrived. For example, we don't seem to explicitly see Red Skull die in The First Avenger for example, but I don't know if Disney would want him to be in a theme park due to him being associated with Germany in WW2 at least at some point. Maybe he could have been transported somewhere into space or more specifically to Sakar seeing as how many wormholes-like things there are there. I'm not sure how whatever those portals in the sky of the planet are supposed to work in the MCU, but maybe it's very likely beings will end up at Sakar for some reason when they are traveling with wormholes, whatever Thor has used to go between planets, or similar transportation methods. Maybe if time works in really strange ways there, people can time travel from the future and/or the past and end up coming through one or more of those portals.
