
Board: Gaming
Except those two (and before that, Leona, who was a part of a previous banner, and before that, Athena, who was the focus in a Battle Pass, all in the past two months of this year) were all involved in that Senran Kagura mobile game, as well as the IP itself having a collab with '98 UM Online not too long ago.Counterpoint: Athena and Leona weren't in the same banner. Meanwhile, Mai and Kula are sharing their banner. Incidentally, those two were the DLC KOF characters for DOA6.
Seems too much of a coincidence that SK is inbound. Not to mention having a roster suitable for an all EX class.
I wouldn't take into account what collabs the other KOF game has since they've never shares them between games.
It's not impossible, but I don't see it here.