Ron Dennis is toxic imo, eddy jordan was grilling one of the Mclaren boys this weekend and he put it to him that the reason why several people left Mclaren (Newey, Alonso, Hamilton) was because the place was very difficult to work in because of the Ron Dennis effect.
There was reportedly a spat between Newey and Dennis as early as 2001, when at the time Newey wanted to leave Mclaren for Jaguar after only 2 years.
I don't think anyone wants to work with the man any more. He puts people off, there is no chance imo that Alonso will go to Mclaren if Dennis is around. It was Whitmarsh who was courting Alonso, I think that deal is dead in the water with Dennis in charge once again.