I'm going to be totally real with you guys, but I've more or less reached a decision that I'm going to go a bit canon divergent on Mr N, simply because I can't stand him and how condescending he is, so going separate ways it is. Basically, the idea I have in mind is that, after Owl's attacks on the monkey-fied Rangers on Moria Ecological Island, Mr N decides--after the Planarcadia arc is wrapped up and Asat is presumably defeated--to rejoin Rappa on the hunt for Dr Primitive and to tend to their harmed comrades. He and Ashveil part ways on good terms, especially since Ashveil will presumably resume his role as La Mancha in facing these threats head on. If he stays in Planarcadia, they still separate on friendly terms due to the urgency surrounding Mr N's shared mission with Rappa.