Thread:KNN005/@comment-25266931-20170329125950/@comment-28288412-20170403205712

Oobleck is an educator, huntsman and historian. He is not a Grimm biologist and as such would not be studying in a field that would allow to him know enough about the Grimm to find a way to remove them permanently or even deal a heavier blow than anyone else has managed.

Honestly the best person who could've done that was Merlot, not sure if it was cut dialogue that I found on Youtube or something but the reason he was making those Grimm mutants was to use them while under his control to enslave the rest of the Grimm, effectively eliminating them as a threat to mankind until Salem dealt with him (IIRC). If he played his cards right and wasn't a crazy person he could caused the Grimm to effectively destroy themselves, doubtful he would've done that though due to his obsession with them.