Like I said in my wall of text on page 2 that's longer than every other top-level reply here put together so far, that would be the twist, that we go into the final battle expecting an equal or higher kill rate than the previous battles and then they don't even kill off the final boss.
Seriously, nobody dying and FIREWORKS END would probably be the most interesting twist they could pull at this point, since it seems like they've gone out of their way to make it seem like that ending would be impossible to reach.
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Either that, or Sunrise pulls a fake-out and nobody dies.
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Then force them to make the spin off "Gino's Adventures Through Time." 8D
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Seriously, nobody dying and FIREWORKS END would probably be the most interesting twist they could pull at this point, since it seems like they've gone out of their way to make it seem like that ending would be impossible to reach.