I thought the same about Leipzig today. There only defense is to press - but after the last matches and the Wednesday match they seemed too tired for that. I guess that even with 11 men that would not have been different - might just have taken a little longer. In the back they have 18- und 19- year olds. If Bayern really would have wanted (or would not have most of the offensives injured) that could have gotten messy.
The only goal against with Heynckes was the penalty in the Leipzig cup match. The last lost match in the Bundesliga happened October 28th 2012 - exactly 5 years ago. The only match we lost with Heynckes after that was a 0:2 to mighty Arsenal...