Oh gawd. Here we go again. Unique circumstances; disaster pending.
So the pilots of XGY and XGA were "inexperienced general aviation aircraft [pilots]", were they Compylot?
What strikes me about the circumstances is the number of radio transmissions. So much talk; sooooo much talk.
Yet insufficient situational awareness.
On the part of pilots who cannot be described as "inexperienced".
Here's an idea: Let's turn aerodromes with CTAFs into Romeos for inexperienced GA pilots 30 minutes either side of the ETA of an RPT aircraft. Hmmmm, that may not work, because experienced GA pilots don't read NOTAMs, or understand them even if they do.
AFIS(Z) or CAGRO. Brilliant! Hmmmm, that may not work, because inexperienced GA pilots might not broadcast their existence or location, or might get their location wrong.
So we're back to Porter's solution: Tower, primary and secondary radar all round!
Since forever, relatively junior pilots who finally get that gig in the left hand seat of heavy metal spend their waking duty hours fretting about inexperienced GA pilots. It's an insight into their own views as to their own levels of competence 'back in the day'.