Going by the Tele article - McAvoy was at training on Monday, discussions took place and by Thursday he had decided he was going to Carlisle and the Tele were contacting the club on Friday morning looking for quotes for their article.
Just me that thinks a few days isn't that much time at all rather than some long drawn out delay that it's been made out to be? So more than likely he just fancied the Carlisle option when it arose? (and he hasn't even been appointed yet so could easily have just been leaked as an attempt to pressure Morton into doing a deal).
If he did chuck his toys out the pram because it took a couple of days though then we are probably better off well rid anyway.
Why did he leave? I know he left pretty much straight into another job but did he also leave under a cloud?