very recently in the "is there possible to have a new tier list" thread, there was a very heated discussion about if jiggs and peach should be moved because of the performances of mango and armada.
in a nutshell, the Pro revamp side said that mango and armada showed that jiggs and peachs metagame had evolved because jiggs was now winning consistently, and peach had never won, or made it to gf of a national tourny, and so both should be moved up.
the Against revamp side said that armada and mango where simply using characters that had the ability to win (hence being high teir) and simply being flat out BETTER than everyone else, despite the character metagame being the same as years past.
If you use one particular player of one character (say...taj or kage) and use them as evidence of said character's metagame, and say everyone else isnt up to scratch, then its tough to call if the characters metagame is evolving and only one person is utilizing it, or it so happens that one player is just flat out better at this game.