I fully agree with you when you say that Bochum will be a good examination of Leverkusen’s strength. Having seen Bochum’s performance in the recent past their victory over giants like Schalke means that they are capable of producing a upset hence Leverkusen should brace for the worst. (...)
In their first clash this season (1-1), Leverkusen had a bit of a dip in performance, they had a few games in a row that ended in draws. Plus, Bochum had a home advantage.
In the previous season, Bochum got demolished by Leverkusen twice: first 4-0 in the first half of the season and then 5-0.
So if we want to consider the most recent head to head results, Leverkusen is rightfully a clear favourite.
But let's not forget that Bayern has a much better goal difference than Leverkusen (currently +51 Vs +26) so, in practice, Leverkusen has to make up 7, not 6 points to win the league.