^^^
The description that you give of the Darkside MP bug and that it only affects "bad" drk's goes very much against my experience with this bug.
The most common occurrence that I encounter this is near the beginning of engaging a group and I will see Darkside get turned off even when I have only used 2-3 moves that use MP and should have 1/2 to 2/3 of my MP intact. I don't see how that is a situation of bad MP management.