You do not understand European sports medias. Let me explain it for you. The sports medias are affiliated with a club, usually the bigger ones.
A report you are reading can come from Panathinaikos media, AEK media, Olympiacos media....................then there is also the basketball journalists and some of them have their own angle or reason for a report.
Then there are the Masonic members. They have there own objective and it is national team based. Finally there is the medias that are just reporting like a 24 news service something like ESPN news.
So basically for you to understand it is very simple. When you see things like "it is widely believed Bourousis prefers Greece or wants to stay with Olympiacos" that it is just some writer making up crap. He is just stating that for his own reasons.
Just like the US articles say things like "no way Spurs can afford Bourousis" "no way Spurs can outbid Olympiacos" "Bourousis does not want to play in the NBA, he is just using the Spurs to get more money from Olympiacos".
That is made up bull from a dumb ass writer with his own objectives. The bull is the same whether in US or Greece. Just ignore the speculation parts, or you can say ignore what Bruno posts. And don't worry about US or Greek media reliability. The big Greek sports medias are no more or less reliable than ESPN for example.