Indeed. Unfortunately if someone applied the tactic, he already got 1 lose because Leverkusen failed to win in the second match. How if Leverkusen never played at their best level again this season? It will be a disaster if someone tries to rely on the tactic. Even in another league (ex: Serie A), there is no big team playing consistently. AC Milan and AS Roma are 2 examples of big teams but performed very badly in the early season. I just can't imagine if someone bets in these teams for the whole season. 
Don't bet on Leverkusen, bet on Manchester City, Real Madrid or Bayern Munich, I'm sure the winning chance is 70%-80% from all match. Never hope an one season wonder team can be consistent, they're similar like Napoli, in Serie A every teams are not consistent, but Inter is better among other top teams.I'd say Manchester City is more promising, they're always consistent.