I can defeat it with Wind Main, Shisui, Kushimaru and SB Kurenai even if I have lower bp and init. There's just 2 conditions tho: all my ninjas must survive round 1, and ay's mystery on round 2. After that I just chaos Ay with Shisui and immobilize Earth main with Kushimaru then reset skills with Wind Main. The set up is much easier if Earth main uses his mystery on round 1.