Seems to be lots of focus on the Captain. So much so that I heard the following phrase on BBC Radio 2 - "They are searching the pilot's home". I am assuming they mean the Captain, as the press still have the quaint habit of calling Captain and First Officer, Pilot and Co-Pilot.
So have the press forgotten there is a second pilot at all? I assume they are probably investigating the first officer as well, but BBC don't deem it necessary to mention this.
I think people are barking up the wrong tree about the Captain and his home sim. I doubt that is relevant.
So there were some allegations about the First Officer letting people into the cockpit before. Was this an isolated incident or did it happen more than once? Is it possible that, if the FO was known to be amenable to cockpit visitors, that one of his flights was targetted by would-be hijackers for that very reason? The FO would not have to necessarily be 'in on it'.