[FreshToku]

Well if you were counting that in your rewatch, you ought to have gone further back and included Ghost and OOO's cameos in Surprise Future and The GaiaMemories of Fate!

You mentioning the neatness of the gimmicks reminded me of how even way back in 2012 when I watched OOO for the first time, I was thinking to myself how I wished he didn't have a regular (but cool!) sword and only ever relied on whatever weapons his chest medal provided him. As a compromise, maybe the swords Kamikiri medal summons are the merch you buy that has a slot for cell medals... and same for the fists the Gorilla medal gives etc.