The lack of updates and mystery around the extent of Daniel Bryan's condition is always going to lead to speculation that he could return at events like Battleground. He's a really private guy, so no one really knows what's going on with him. As for the WWE, they've got his injury status on lockdown, as they don't want to be under scrutiny over current injuries when the ex-employee concussion cases are ongoing. It is thought that Bryan's injury is concussion related. The timeline for that could be short, it could be long, no one really knows the specifics of his condition. As such there's always the potential for a sudden return, but you'd have to lean towards thinking it unlikely. As such, it would be a massive shock he showed up this weekend.