Forgive me, but I really don't get where people are getting this "Echo Fighters are doomed to be glorified alts forever!" mantra from. Who's to say a popular Echo Fighter in one game can't be given the Luigi treatment the next? Is it because Lucina and Dark Pit are still clones of Marth and Pit? That's a downright puny sample size, all things considered, so those two characters' fates can hardly be considered conclusive evidence to say the least. And furthermore, what of the fates of ex-clones like Luigi, Ganondorf, and Falco? Do they not count just because they've never been called "Echo Fighters"? That'd be ironic indeed, considering these are some of the same people who so readily chastise others for suddenly treating clones differently when put under a different label. If demand is high enough for an Echo Fighter to be represented more faithfully to their own abilities, then I see no reason they can't be decloned in the future, as if the Echo Fighter label is some obscure penance that character necessarily has to bear with them through their entire future as a fighter. Sakurai has implied nothing of the sort for any Echo Fighter, existing or potential, so I suggest people drop this absolutist attitude regarding them.
Yeah, that's a bad comparison.
Echo fighters are nearly 1:1 with their source chaarcters in terms of stuff like movement speed, height, weight, etc, with all the same moves (potentially barring Final Smashes) and minimal, and sometimes nearly nonexistent differences, essentially a glorified alt. Falco, Ganondorf, Roy, etc were never echos, because they had many differences in moveset and general attributes that meant you had to play them differently from their source character.
Because Ganondorf has had 17 years to be made truly unique, but he's still a clone of Captain Falcon. There WAS time. There WAS fan demand. And very few came from it.
Changing 3 smashes to some other character's doesn't change the other 90% of his movelist.
Sakurai is obsessed with this idea of not alienating the fans, making characters like Roy, Young Link, Toon Link, Ganondorf, Dark Pit, Lucina still remain relatively the same with some modifications despite having far more to draw from and/or no reason to have their moves be based off someone else.
Luigi is the exception to this trend and had the benefit of being an extremely early character. He is the exception, not the rule, or even a likely possibility.
Yeah, a lot of this isn't accurate. Almost every clone/semi-clone makes at least some sense sharing their moveset with another fighter. (In fact, the only character that dosen't have an in-universe justification is Ganondorf):
-Luigi: He is Mario's Player 2, and typically plays similarly or identically to Mario.
-Dr Mario: He IS Mario. Can't get much more Mario, than, well, the guy himself.
-Young Link: Similar to Dr Mario, Young Link is the same person as his source character, but younger.
-Falco: Fox's second in command and uses the same gear as he does.
-Pichu: Pikachu's baby form, and he shares most of Pikachu's abilities.
-Roy: Has the same role as Marth in his home series (a young boy who is also a Lord class unit)
-Toon Link: Same as Young Link (but Toon Link is also a different incarnation)
-Lucina: She is Marth's descendant and poses as Marth for a good chunk of Awakening. Also, she is a Lord class unit like Marth.
-Dark Pit: A literal clone of Pit in his home series in every single way except personality. Also, they play identically to each other in Uprising.
-Daisy: Was made to fill the same role that Peach normally does in Super Mario Land
Oh yeah, and also, I'd like to point out that a lot of these characters aren't even full clones anymore. Falco and Ganondorf became semi-clones as of Brawl, and Roy's a semi-clone as of Smash 4. Also, because of the changes made to Link in Ultimate, Young Link's now a semi-clone by simply staying exactly the same.
(And is it really so bad that Sakurai doesn't want to alienate his fans? He should definitely get credit for slowly differentiating clones further from their source characters)