late, but the banning a stage when you win rule is a bull load of bullstuff
how? i use ganondorf, and ganondorf is great on low height platform stages, so if i win the first match and then ban fd and something like town and city, there's still duck hunt, lylat cruise and smashville which are good choices against ganondorf
same thing with dedede, ban duck hunt (high ceiling, dedede is very hard to launch upward, if you don't see the advantage i can't help you) and fd so his gordo won't have as much pressure when he uses it from the air or with his low velocity way of throwing it (because it'd just hit the platforms)