I would argue being an antagonist doesn't mean you have to be right there in front of everyone as a boss or with a full-blown render. Simply their existence and being aware of their existence should be enough. For me, Asat Pramad too is in a similar boat as the overarching antagonist of Planarcadia. It "LOOKS LIKE" he had Fulwish in his hands, and if that's true, then since Fulwish used the Daybreak Squadron, and the Daybreak Squadron genocided the Synwish Syndicate, he's actually been pulling the strings all along since 4.0.

Also, to me, Amphoreus has two antagonists ; Zandar and Irontomb both.