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the grand Kai's planet is called relatively small, relative, meaning, compared to other structures in the realm. By itself it contains STARS, it's bigger then any planet or star in the living world. The only thing it's higer than in afterlife is probably king Kai's planet- which used to be much bigger than it until beerus nuked it-
- Living world is the LOWER half, while afterlife is the UPPER half, nothing said they were each 50% of the full macrocasm nor any of those other sizes, that already debunks 90% of this argument, same with the afterlife being divided into realms, nothing is said of how much space the individual structures there take up.
- The only thing controversial in otherworld is that how they look from the outside when you're moving through otherworld's space is a different story to what they actually contain on the inside