They removed the level caps for all of CoP. So you don't need a static now. There might be 1 mission where you need 2 ppl for switches and since you're doing it with a friend you shouldn't have any problems.
This is true. Other than the part in the Sacrarium where you require two keys to open the door, the Tenzen fight, and the 8-3 fight against the 4 pots, I did CoP from the beginning of Chapter 5 on solo. If you & your friend are both level 99, I'd imagine you two could duo it with little trouble.
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