What do you think the final boss should've been?

Since the general consensus (around here) is that Antasma's potential was wasted, and the game's actual final boss was a total disappointment (and not to mention being a blatant copout), I thought I'd go ahead and make this poll. If Antasma were to be the final boss in Dream Team, how would you have preferred things to be? Would you rather have a standalone battle against him as he already was (with the only difference being the order in which he's fought)? Or would you rather have there be something more, as shown in the rest of the poll options? As for me, I personally wouldn't have cared what form he had, just as long as he had a chance to shine.