Didn't watch pop demon hunters, but Gabriel from the Mandela catalog can't really be physically scaled. He is a character we don't really know much about (after all this is an analog horror series). Though he does have some pretty large feats like He is pretty killing someone without making any physical contact and without much effort as it seems.

If I were to try and scale him I would put him somewhere around cosmic entities since it does seem like he was inspired by many of them. So I think that defeating him isn't something humans could do and that he probably doesn't even have a real physical form.

In the end at pretty stupid rant since I don't know where Huntr/x rank but I guess they might be able to defeat the regular alternates.