Hahahaha, yesh it is... Well I'll give my own opinions on em.... On KZ, use Mushuwhen the shield thingy comes up, helps a fair bit... use Dodge Roll or Guard when he does the spinning blades thing, but time it really well. For the Phantom, all magic battle. Make sure you use Stop on the clock heaps, otherwse one of your partners will faint.... and yeah... the colours correspond to the magic you have to use
EDIT: Oh, heh heh, my bad, misread about Kurt Zisa... Ehe heh heh...
Ok, for Sephi... RUN AWAY!!! Nah... Well Aeroga really helps, use it all the time... Dont worry about strike raid etc, only worry about useing Ars Arcanum when he's using the Fire Columns... And when he's in the air, used super glide and get him ASAP, otherwise *kaput*