Until we hear about someone leaving the team / Ava Jones retiring, it would seem this is really the only option. Chatter on Hawkeye Report board (seemingly stemming from a Swarm insider) supports this as well.
There are still rules and not all athletes on scholarships can become walk-ons. Official information is difficult to find but I was able to find a website around this time last year that was geared toward parents of student athletes and it had some vague info. It was not official but it was well-written and not weird clickbait junk.
I don't remember everything but I'm fairly sure that, if nothing else, if a student was "officially" recruited (meaning, for example, they took an official visit) they cannot become a walk-on. Other stipulations regarding "official" recruitment have to do with how and where communications with coaches took place before signing a letter of intent.
