D.Gray-man Encyclopedia

Third exorcist/Mystery of Kanda arcs

I'm wondering, is it really a good idea to make 2 separate arcs for those two story arcs? The third exorcist arc only lasts 3 chapters and is connected to the Alma karma arc as well in stakes as in progress. Both are about Alma Karma being used by the Order. And there is absolutely no cut between them, no rest or something. The exorcists are already all the world and they are attacked. Then suddenly new arc?

Is there any official division (and naming) made by the editor or the author herself? 

Skylent (talk) 16:21, September 29, 2016 (UTC)Skylent