Well that sucks. He was one of their most talented members. Btw, what's the source for him leaving in 2017?
This page from April 2018 still listed him as a member of SuperSweep:
http://www.capcom.co.jp/game/content/rockman/message/
And he was still listed on SuperSweep's website one week ago:
http://webcache.googleusercontent.co...&ct=clnk&gl=us