Us mere mortals will never really know what goes on behind the scenes of the club! Whether or not Kean was actually booted because of his skills and ability to do the job, we'll never know! I always though he was a decent coach though so I'm glad he's found another place to work!
Bear in mind that he was assistant manager here and is a coach there, so there's a bit of a difference with regards responsibility and the like. I doubt Kean was let go due to not being good enough, though. Maybe a new direction was needed in Harrison.
Apparently he has worked with England etc under McLaren (literally?) but from the good football I have seen this season it looks as if he is doing well!