Bertus has better insight in to the on-goings at PSG than most of us who can only make assumptions on the concerned subject. He's already explained PSG's position on Marcos, yet some posters come across arrogant and obtuse. Hence, why his posts appear defensive.
Keeping on the subject, Marcos would be smart to stay at PSG, as he's not going to get any more mins in Barca than he would at PSG. Infact, it's likely he'll see more games in PSG when looking at his competition (one aging and injury prone, the other error prone) and the fact that he's already adapted to ligue1. Here, he has to contend with more pressure, lesser room for error, and more competition. And people who think he'll be an undisputed starter(or any CB for that matter) under Lucho will be in for a surprise.