I suggest dropping Zelda and Sheik from the list and just giving their points to Zelda/Sheik. At this point, it's clear that the transforming style is dominant over a pure style either way which effectively makes never changing into just that: a playstyle. I think the old justification for counting them separately in melee really boiled down to "Sheik is so much better than Zelda that switching between them doesn't make sense". I think that kinda holds for Samus/Zero Suit Samus still (the number of players who use the Samus -> Zero Suit Samus taunt transformation mid-match is insignificant, and Zero Suit Samus is obviously the way better form), but it just doesn't hold for Zelda/Sheik. The reason I bring this up is because the separate counting system under represents Zelda/Sheik as a character; adding all three together would give a total of 59.8 which would be slightly above Donkey Kong and would seem to be generally more honestly depict how good they are.
About Meta Knight's continuing rise (addressed to everyone), it's fueling itself. I'm not saying that Meta Knight isn't good (he is good), but just take the shoes of someone who is totally new to the game looking at this topic deciding which character to use. He sees Meta Knight with 1385.8 points which is more than any two other scores added together. He'll use Meta Knight. If he wins, Meta Knight gets more points. This isn't necessarily permanent. It leads the game to be oversaturated with Meta Knight well beyond what the game's real balance suggests, and that means the elements of the game that work against Meta Knight have the potential to become dominant, word will spread about this "new" threat (even if it was there all along), and there will be a huge re-alignment. Of course, the elements that lost to Meta Knight but do well against the things that beat him then can re-emerge, and it all "starts over" but less drastic each time as we spiral toward the game's real balance.
To be fair, there IS a possibility that it doesn't stop, that Meta Knight actually has no real way to stop him, and that the game eventually becomes so saturated with Meta Knight that it's clear that absolutely nothing else is viable. Then and only then does ban talk become reasonable. The odds of the current numbers being stable are very slim due to the magnitude of Meta Knight's current lead; the future will doubtless provide much clearer guidance than a premature ban.