[Sunred]

I sometimes look at this pic during the time they announced Gaim:


and wonder if maybe Zack was planned to be Gridon early on during the initial drafts of the story considering he is Kaito's bro, only to have that idea scrapped to get the story that we know it as.
The reason I think this is because Gridon was not as close with Baron but more with Bravo as the story progressed.
I will not abandon the possibility of other scenarios where Jyonouchi becomes Kaito's bro in that alt universe due to whatever events may have unfolded, but yeah just a thought.
Also, considering Baron is a knight and Gridon is more of a squire/medieval foot soldier design-wise.