Oh come on, without CH our FP-abilities are still outstanding. Best class invented in a MMO ever! Hands down.
One could of course make Shaddow and FP diferent tho, so FP for buffs and shaddow for mimicing the combat-ablities. Or just have 1 tier of FP (instead of False, Assume, Mimic) for agents, then build on the assassin-theme.