Or it could just be the players, Brewers were good with him too and the Cubs haven't been all that great without him til this season despite the last 2 months.
SP for the Cubs been up and down, bullpen had its moments but overall down, bench sucks, hitters look like they been on an early Vacation since June.
I do agree that he doesn't seem like the kind of manager that lights fire under his players when needed and that probably his downfall with his teams.