Koscielny was a starter last season, so that's a rather big assumption on your part, Klaus.
I'm all for transparency and honesty. All the cloak and dagger from the club before only served to drive a wedge between the club and the fans in my opinion. Wenger was the king of it. You could never believe a word the man said. Yes, some of that is playing the transfer game, but you got the impression that both he and the club would lie about anything if it avoided a shit storm or would make them look bad.
In this scenario there's no way the club would have made a public statement. Wenger would have made up some rubbish about a calf strain keeping Koscielny back at Colney, some of the journos and Twitter ITKs would have whispered about Koscielny being on strike, no one would have believed it of him, Arsenal would have granted him his free transfer, the fans would have gone crazy at the club for doing so, not knowing Koscielny had forced them to.
Transparency and honesty work much better in my view. The fans need to be able to trust the likes of Sanllehi and Edu. That they're working for the good of the fans and not against them.