Well, if you recall the year prior to 2015, there were all kinds of rumours that seemed to have validity that Rogers was courting replacements for Beeston (specifically Dan Duquette, then GM of the Orioles and Kenny Williams, then GM of the White Sox) for when his contract ran out at the end of 2014 and that did not go over well with either Beeston or AA. The scuttlebutt at the time was that the 1 year extension that Beeston signed was done almost begrudgingly and AA decided right then he wasn’t going to extend past 2015 when his deal expired. Before 2015 even started though it was announced that Beeston would be retiring at the end of 2015.
Shapiro offered AA an extension, AA turned it down. AAs quotes on why he left:
“For myself, my next expedition in baseball, my number one priority will be who can I learn from. Where could I go and just be exposed to some things that I haven’t and just improve and come out a lot better whether it’s two years or three years from now.”
“Two, key people you want to work with that you respect that you get along with certainly would be important.”
“The third part, role and things like that, I wouldn’t really concern myself with that. Dollars, role; that would really be last on the list.”
“It would just be where can I get better, where can I learn, where can I have some fun … and the rest will just take care of itself.”
I suppose depending on the lens, those quotes could be used to support either explanation, but it was clear AA no longer wanted to be in Toronto once Beeston was gone.