Not really. Kouta isn't the only player to have issues with the way Pagan went about it in that time.Didn't mind the Kouta one but I found it interesting that he fell out with pagan to the point they don't talk anymore, and then his new coach in Ratten didn't want him at the club, not even for free. There's a common demoninator there.
As for Ratten, that's a bit confusing. I'm guessing that the club wanted to move on from the dark days of 2002-2007 and didn't really want one of the recognisable figures of that period heading straight into the coaches box. I do recall Kouta's huge salary being something that angered some fans as he got towards the end of his career.