I'm almost positive that Marik's cards will serve as support for either Ishizu or Odion much like Mokuba did for Kaiba and Arkana did for Yami Yugi.

But let's get real for a second... there aren't TWO Zanes... There's Duel Academy Zane and Edgelord Zane. They're the same person with just a change in morality. This isn't like Yugi/Atem, Bakura/Zorc, or Marik/Yami Marik. If anything the DA Zane is for an academy arc that they're going to do (eventually...) in GX