I feel that M3D (former MLG tournament director) said it best in the Smash Back Room. He pointed out that at this point in the game, there is no point in trying to differentiate which character is better than whom in any given tier. Fox, Falco, Marth, and Sheik are the best characters now. They all take turns beating each other. Sometimes, one particular character wins at several tournaments, but in the end, those are the magic four, and it more depends on who is playing them than which character was used.
As for the other tiers, the same thing ought to apply. Once grouped into a particular tier, the sequence really should not matter. Sure, "Link > Young Link" according to some people, but Young Link can just as easily beat Link because they are in the same tier. It is all just a numbers game. They were sequenced based on which one tends to beat the other, not on repeat landslide victories (at which point, they belong in another tier).
It's not even worth stressing over anymore. Brawl will be out int two months.