“Headcanon” only applies when your fluffies stick to the core tenets of what a fluffy is. That cannibal does not.
You can’t “muh headcanon” your way into making anything you want. That’s not how it works.
For clarification take a look at rule 12 here.
Quite frankly, if it wasn’t for the green one on the right, this probably would’ve been deleted by now.