To an extent I agree with this. You should fit as many buffs in with a CO as possible. I always shoot for AoE card buffs+my LA minimum. If I know a rough part of a fight is coming up, I'll save CO to use with Synastry. I DON'T think you should pop a bunch of buffs purely just to use CO to its "maximum effectiveness". There's still a time and place for each buff in most fights. (Least that's how I plot out my fights.) If I can save my CO for those times I do, but if I draw AoE Balance way beforehand, I'll most likely extend it with CO to get the most out of the card buff.