I was totally thinking the same thing!!!

Make a little pedestal for Castle Grayskullman to stand on or perhaps King Grayskull statute.

They could also add a small wall painting of the Horde-Snakeman battle from the MYP episode.

Make a place for the orb holder from TOD S

Since we have the weapons rack, give us the smaller one with the red weapons with the rusty deco to match the rest.

The only reuse I could see is the white Preternia version or perhaps the throne being repainted and used for Zodac's flying chair