LogFAQs > #955921198

Anyway, I know the 6* magicite active abilities are substantially better than 5* ones, but do I immediately replace one of the 5*s with the level 65 6*?

If you're taking on 6* Magicite, definitely yes. Let's say you're going up against Valefor (6* Wind). You want Shiva as your main magicite, because it does tons of fixed damage and applies minor imperil ice on follow-up attacks. You want Valefor as a secondary magicite, because bringing a 6* Magicite to fight itself buffs your party (along the lines of 10% damage dealt and -10% damage taken, IIRC, before considering that they'll provide some Dampen <Element>.). And then you want some combination of 5* ice magicite and Madeens (no 6* has, or can acquire, Madeen's "damage increases as HP increases" passive.) Offhand, probably two Madeens and a Manticore, but that I'm less sure of.

Cater's AASB2 seems to be another full break counter if I'm reading it correctly?

+Atk/Def/Mag/Res, so yep, it'll counter Full Break. You'll still want Mog or suchlike in other realms, but you can consider using Cater instead in Type 0 - or use both in Type 0, so that you can counter both the weaker Phase 2 and the stronger Phase 3 debuffs even before honing Mog AASB2.
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I don't like this duchy. Now, it's an adventurer.