There might well be more than one cave. If the Guardian ruins thought us anything it's to keep looking, even if the trailer content is located.
Yeah that's definitely possible.
So I guess, in addition to this capship battle site, the question would be whether there's any way to infer a likely location based on knowledge of guardian sites (too far?) barnacles or UPs/UAs.
Yeah I can hear everyone saying it now: 'Like we haven't already tried that!'
But I'm coming at this relatively fresh: the whole Gas Giant Moon theory seems reasonable, in and around barnacle centres, given that we now have a direct link to the flower ships to the barnacles.
I've got to put a Lev#5 FSD on my stored Asp tonight (only got three rolls so hopefully one will be good!) and I'm gonna head out to this wreck system as a start (and probably find nothing!) then see where life takes me afterwards.
Despondency, most likely!