I see what you’re saying, and that’s true. They can push to have an indictment as well as not push.
I have a family member who claims to have been raped by a neighbor. It was sent to a grand jury. They didn’t indict the neighbor either, and I think it was because they couldn’t get pass the he said/she said reasonable doubt factor.
There was no question that a sexual act took place. The consent was the part they couldn’t ascertain. It didn’t seem to be a case that they felt they could win on the prosecution part.
Maybe that’s what happened here, too. Just speculating.
I’ve served on a grand jury. All the panel knows is what evidence investigators and the district attorney choose to present. If they don’t want a conviction, they simply withhold evidence or testimony.