Regarding the Merc question, Infinity on him is not really needed since that is your main weapon, so yes, an Insight is the best way to go.
I used a Holy Freeze Merc with mine because I just like the slowing.
And on switch I used a CTA.
A CTA with 6 to Battle Orders is obviously what we're aiming for, but the ultimate would be a CTA 6 in an ES Staff, I actually didnt think of that.
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Made the sorc too, very nice. But should i get 5@res sc's or doesnt res mather?
Resistances only works on life, which is 5% (95% ES), so no, resistances are not very important.
Poison could be really useful though sinc that will drain your life instantly.
Thanks for the comments guys. Appreciate it.