Hmm, sounds like a good enough strategy, although to be honest, using Vanille + Death sounds easier, just summon her Eidolon, and spam Death, lol...
Got a question, since you've finished it, and I'm only on Chapter 11 (Been grinding as soon as I got onto Pulse, lol, 8 hours... yay), what role would Sazh be best at? Since I have no idea and he seems so mediocre...
At the moment, my party is Hope/Lightning/Snow, because at the moment, Snow is the best Commando and Sentinal due to me levelling up his weapon, I'll switch to Fang though when I get the Taming Pole and upgrade it some, but at the moment, Snow is the best of the best of the best, he can hit 6k normally, while Hope/Lightning hit 2-3k lol...
It's great because if I get a pre-emptive strike on the Behemoth Kings, I can kill 'em in, on average, 22 seconds, which is great since it gives 4k CP.