Personally I'll put EXO and BP on the same rank, since EXO have better physical sales and touring number it seems. And maybe I'll put Ikon at no 5.
Anyway, overall 3rd gen groups are very weak compared to 2nd gen groups in Japan. From 2nd gen groups we have TVXQ, Bigbang, KARA, SNSD doing extremely well in Japan, other groups like 2pm, Suju, Shinee were doing pretty good as well.