Thanks. So Anubis and Managarmr are actually still useful for a grid (like mine right now) that has only a single dark or light Eidolon in it as they still give me 80% dark/light attack. For each Eidolon I replace that goes up by 4%-8% and the friend Eidolon's HP/ATK stats aren't actually factored into my current ATK and HP so I don't lose any base ATK if I was to switch out my main (not that I have one to switch to anyways).
Thanks.
Dejnov.