>>5454405The lack of storage in the arm for the mace was obvious because they needed to add another forearm cannon for show accuracy, but that doesn't mean they wouldn't add the mace as a separate piece. The swords are missing on those pictures too and we know they will be including them.
I don't really care that much about the mace anyways. It will be cool if they include it as a nod to the original toy, but it's not that important to me. If I want to pose him with the mace I already own two Ultra Primals that can lend him one.