O.K. Knowing the FF6 OST fairly well, during the first read through, my mind combed the whole soundtrack searching for the song. Then, I get to this one part at somewhere near 1:20 where I hear just a taste of the melody, but it is so slow and orchestral that it made me second guess myself. No, that's not the boss theme, Cyan, you're crazy. Then, 2:40 rolls around, and I hear a good portion of the melody, and I'm like WHAT??! THIS CAN NOT BE THE BOSS THEME--its soo beautiful and....and not boss like. Very interesting take on the boss theme Gray, excellent idea...its just soo....unnatural that it sounds like that, but its so good too. The only complaint is the section at 1:40 because the electronic section didn't really fit in with the mostly orchestral sound in my opionion. Otherwise great job.
[edit] I'm not really sure if "The Decisive Battle" was the only theme in the piece, but it was the one i managed to pick out and was most surprised by its style of play.