The next big bad in AEW?

Just something I was curious about and that I was discussing with a friend. After Mox, who's the next big bad/main heel in the works? MJF seems like the obvious choice, but I'd love for Okada to lose his match with Omega and be turned into a serious monster after taking it relatively easy for the majority of his AEW career. I guess Edge or Darby would return as heels, but I don't see either of them having the aura of either MJF or Okada as the main event heels.

Any thoughts on who else?