Consider saving your seals for edo yagura treasure when it comes out again. 4* edo yagura together with 4* habanero kushina will make hell of a team after their respective skill trials come out. As for super rares- ay is too expensive for 99.9% of players to use him effectively because he needs 4* and skillbooks. Susanoo Sasuke needs 4* and skill trial to be usable because without Y mystery he doesnt do anything- he will get bond mystery in the future tho. So if you want to get 1st SR in kage, you can but you most likely will never use those ninjas.

Kurama even with bond mystery is outclassed by sosp. Madara just recently got skillbooks and bond mystery in cn, so nobody really knows if he makes a real comeback or not. From those 4 super rares, as a base ninja without books/bond madara is the most commonly used, although there are better teams that sadly base on only event ninjas. But you can never go wrong with gnw/edo treasures, since you get hashi frags and in the long run hashi >> ss itachi.