Firstly, thanks for your politeness.
It is entirely possible (and probable) that when Farah was altitute training in Ethiopia etc. he simply linked in with Aden's group at the track (there's only one main facility in Ethiopia) to have some fast runners to train with. This would involve no more than meeting up at the track, socialising with a few afterwards and then parting ways. I wouldn't expect him to know all the athlete's names, to go into their or Aden's rooms, or to trade doping tips.
Secondly, Farah trains with the NOP but he is a British athlete foremost. BA is running a training camp and has taken some athletes to Font Romeu ahead of Rio. I don't expect Farah has a lot of choice in whether he goes or not seeing as they give him £60k of funding each year as a 'podium level' athlete. If he wants to keep getting that, which he clearly does as he hasn't refused it as of yet, then he has to do what they say some of the year.
So yes, personally I do believe this to be a coincidence. Athletics is a small world. Many athletes can be found to have been training in the same place as Aden and some will currently be in Font Romeu. If anyone can be bothered to look. But they can't, and Farah is a big name, his activities are well publicised and he is disliked on the forums so it makes sense to leave the research there.