I do wish monsters gained CP like Serah / Noel. That's my only real complaint with them. It can be obnoxious finding enough of those droplets/orbs/chips to level them up consistently. Otherwise, I like them as a third party member. Definitely enjoying XIII-2 much more than XIII.
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"When I was a young man, I had liberty, but I did not see it. I had time, but I did not know it."