if falcon has the room for it, trading a falcon kick for an extra double jump is actually advantageous for him (in terms of length of recovery). the forward distance of the kick and the up and forward distance of the double jump outweight the downward distance of the kick.
it works better with ganon's though, because his foot goes much less distance.
if you don't believe that falcon/ganon get extra jumps after down b, go to hyrule and jump off, facing the stage, on the righthand side. now double jump, falcon kick and double jump again. see, it works
DDR: want to pass Paranoia Survivor ~ Religions are just cults with more members. -- The resident SSB:M Captain Falcon user. -- "Let's eat fast so we can eat again!" ~ Ash