I just watched the highlights of Leverkusen - Bayern Munich. There's no doubt Xabi Alonso's team deserved 3 points, but were just out of luck. They dominated the game in shots on goal and in terms of scoring chances created, they also had a small advantage in possession, but the results are not always fair and it's one of those cases.
Unless the highlights I watched are not a good reflection of the game, Bayern almost didn't exist. I guess you could give them some credit for effective defence and not losing a single goal, but they didn't pose any threat in the offence.
I wonder if that was a deliberate tactic by Kompany to just focus on the defence, given they already have 8 points advantage. Maybe his strategy was to keep the status quo rather than take a risk and expose themselves to the possibility of a loss. I don't know. But, as I said before, 8 points might be impossible for Leverkusen to catch up.