User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27362456-20160722160948/@comment-27362456-20160722183556

Apparently Shura (red) and Hisui (green) might have something to do with Shusui. People speculate they had battled, the loser giving up their power. Shura won and took Hisui's power and became the War demon Shusui. Not able to control his power he ran into the black demon and was saved and trained by Raaga.

TBH I have no issue with these units as long as Alim makes an official version of Shusui like they did for Kalon and Melord