Hopefully you can see from my examples, though, why these few problematic folders remain.
BRU is designed for renaming en-masse (in bulk), applying the same scenario to lots of files/folders. You seem to have a situation where you've got lots of variations, as not all are the same. So you will find that you have to attack them in batches. Find the combination which solves 80%, then the combination that solves 80% of the remainder, then 80% of the remainder, etc. until you can whittle it down to a handful.
All three of your remaining examples could be solved, again using variations on the existing solution. So there's always a way - somehow
Let me know if there's any remaining combinations which you can't solve.