God that cartoon Dixie is so unsettling...what actual human being signed off on this animation?
What you're saying is totally understandable. I myself have done much of the same. The problem I think everyone is having is the method you've brought it up.
You weren't a regular on this thread or a part of any of the discussion. You turned up, warned everyone not to get their hopes up, inadvertently being kind of a pessimist and a Debbie downer, then provided no input about her character, or what you'd like to see, or even that you directly support her inclusion (you claimed the opposite briefly out of spite for Sceptile in fact). Drop in, knock everyone down a peg, and then go about your business.
That'd be like me coming to the Sora thread (which I'm assuming you support based off of your name), which I've never been to before, and saying "don't get your hopes up guys only for potential crushing defeat later, we already have Cloud, Sora is not quite deserving of the time to be made a unique fighter so he's a no go, keep your expectations low", etc etc, then arguing with his supporters when they found it kind of rude.
Your point of view is valid. It's the way you brought it about. You didn't come to talk about Dixie, you came to "lower everyone's expectations."
That all said, Echo is such an intangible term by now, that I'm going to assume anyone who's even remotely built off of another fighter will get the Echo label in this game.