I just beat this triple healer team in arena last night facing a 70k Six Paths Sennin in Training Battle (I know my opponent was 70k+ coz he/she was wearing the samurai outfit). I used the team I heard that I posted above. Konan, Shurado, Fire main, Onoki. Hokage Tsunade was already dead after round 1 from Shurado mystery+ignite. Round 3 killed Water main. Round 6 Roshi and Sailor Sakura died at the same time. Or maybe I was just lucky that time coz Shurado mystery crit Hokage Tsunade at round 1 + Fire main chase hit Water main and Sailor Sakura igniting them + Sailor Sakura was also immobilized by Fire main's mystery so no AOE damage on my team.