Unfortunately, access to the F lounges when carrying the OW Emerald card gives you access to only one guest.
I have had the dragon at LAX call from downstairs to ensure that our son wasn't getting into the AA F lounge with my wife and I. He has to stay in the Biz section.
This was despite having AA EXP as well as BA and QF equivs all current... AND the lounge was less than half full.
On the positive side, F check ins are able to be accessed without issues as are the Priority lines.
In any case, after you are used to the BA F lounges the AA ones aren't really worth getting in a sweat about .