Board Thread:General Discussion/@comment-27157618-20130823030705/@comment-4105472-20130914073018

Yep, Keshin Armed/Mixi Max were mentioned in ep 1 of Galaxy, and they remember some of the hissatsu they learned during Chrono Stone.

So I guess Endou wanted to recruit Ichikawa Zanakurou probably because he's the ancestor of Zanark (not sure yet).