Footnote: I should add that that I don't think any of us has had sight of the contract Emond signed. It's possible that he was brought onto the project under work-for-hire terms by the writers,* in which case he wouldn't be entitled to a creator credit… although that would seem to be at odds with the entire "more equitable deal for the creators" ethos which was supposed to be one of Toxic's founding principles.
*More common than you might think. As I've mentioned before, take a look at the legal blurb of a lot of "creator owned" books and you'll find that a surprising number are "writer owned", meaning that everyone else is on WFH terms. "Creator owned" isn't a universal panacea for inequitable treatment of creators in comics… sometimes, it just changes the nature of who's doing the screwing.