Krystal is, and always will be a definite contender for Smash. She is the FINAL piece to thet StarFox puzzle. In terms of importance, she should have been in Brawl. At this point, she is more important than everyone but Fox and Andross. On top of that. she has a major fanbase as well (coming in at #7 on my poll). Slippy and Peppy aren't even options at this point.
It's basically, Krystal or no new StarFox character. Which you could argue about till the cows come home, and bring up stupid "representation" arguements of invalid remake points. But she is a definite contender.
Terms of importance to the SF storyline, it goes Fox, Andross, Krystal, Wolf, Falco, everyone else.
I don't think most of you realize the reason she wasn't picked for Brawl was because Sakurai simply didn't know anything about the new StarFox games and how important she was. She never had a chance as a character, and there was NO REAL Wolf vs. Krystal war, it was simply Sakurai not keeping up with the series.
Smash 4 is THE best time for Krystal, not Brawl.