It's like Xavier Chen said, due to the lack of in-person playing, really good online play became the key to success for competitive games. Unusual newcomers like Power Rangers saw a big boost and old game like Skullgirls and KillerInstinct got a second wind. That's the whole reason behind it.
Reason why SG is back is due to the fact that during quarantine people finally realized fighting games have really shit online. SG and a few other games have well implemented rollback netcode and not delay based. SG was selected for EVO main stage last year, but allegations with Mr. Wizzy got EVO ca
Simply put, Mike Z got trashed, and skullgirls prospers. Game has a full season of dlc characters planned and got robbed of its chance to be at evo last year.
For those not aware : the fishgal is a character in Skullgirls, named Minette. She was a candidate to become a playable character, based on fan vote. She lost both times, to Eliza (1st one) & Beowulf (2nd time). Jo wanted her in.
Considering the game just released a new character and seems to be gearing up to add more, plus the (in all, but name) firing of MikeZ and the games on going popularity as a competitive fighter, EVO probably just decided that its as good a time as any to give it a spotlight.
No, Mike Z got kicked a... year or so ago? Or at least everyone else quit Lab Zero and Autumn Games basically said, "Uh yeah technically we own the series now, so we'll just hire everyone from Lab Zero EXCEPT MikeZ to come on over."