4-E-2, hm?
If it lasts one turn, Cain wins, obviously. Giffca will likely not get to attack on the player phase, and enemies would surely choose units who they can actually damage to attack. Even if he does get attacked, what does it matter when he's not helping to get Wishblade?
If it lasts two or more turns, Cain's lead dwindles. Simple as that.
However, what if you use a siege tome to kill Levail? Not only are you running out of time to use them, but Blizzard and such aren't helping 4-E-3 like Bolting is. Surely you can spare two or three uses of that one, and keep the rest of your team in a defensive position while you wait for Ike to kill the BK? Turns out 4-E-2 is very slightly in Cain's favour.
From what I can gather, 4-E-1 and 4-E-2 are marginal wins for Cain, 4-E-3 is even, and 4-E-4 is another small win for the king. It comes down to how much Giffca's AS lead matters in 4-E-5.
Not much. Caineghis can't double them without Nasir, but of course, with Nasir, he can. And I can't think of many units who would benifit more than he would from this. His attack is just so high. Still, it takes up one of the spaces from which White Pool can be used.
The auroras should probably all be gone, or mostly gone, by the end of turn one anyway. Beating Ashera on the first turn isn't impossible either. No matter what kind of team you have, you can't really expect to need turn three, and without a heron, Giffca doesn't even participate in turn one. Giffca's doubling ability becomes a moot point here, too.
Somehow, I'm leaning towards Cain again.