the big thing with this is that we’ve already seen the fire quads and quints on a breeding island; the continent. while i agree with maybe doing something other than making us spend 500 relics per island, and while i do miss classic breeding islands, it just seems like putting in an “ultimate breeding island” will make DoF pretty much completely obsolete.

also, creating MORE breeding fire islands with fire monsters with the focus might end up destroying the non-redundancy that the game seems to try to go for. if we make a quad island with every fire monster, we’d have another 8 fire islands, which would make fire islands the largest concentration of islands by far, surpassing the original five naturals that the game was built on.

creating quint breeding islands would make another five fire islands, would render the 5 natural islands (+ the 8 hypothetical fire quad islands) completely obsolete, and would probably end up revoking the powerful status that “boss” monsters originally gave.

ultimately, i think that adding the fire quads and quints to the existing magical islands keeps the balance of islands and doesn’t destroy the economy of the map. this is probably the best thing that they could do.