@Xkorpitron : Stat comparison between itachi susanoo (red +2), roshi (red +2) and kimimaro (yellow +0). You can see the difference of 7 awakenings. Who do you think is the better tank?
Without the little off topic, it could be awesome if amaterasu could get a "little" buff: healing it will only prevent the damage and the extra turns, but it could still block healing until the turn ends to the character affected. This way we could re-extabilish the "every team has a counter", because the 3 healers are atm a bit annoying, if they have enough power / you don't have enough difference in power (as you've seen with the recent and disgustingly famous earth main, sailor sakura, tsunade hokage, kabuto).
Amaterasu comes from 4 characters: 2 high end high cost ninjas (Itachi susanoo - Sasuke susanoo) and 2 low to mid tier ninjas (normal itachi - playboy sasuke). This way, everybody should be able to build a team which could counter heavy healing with a bit of team building, which is something that MUST happens against every team.
Koto amatsukami is probably one of the strongest mystery atm, so no buffs needed imo.