Ive spent 130 seals in Kage and only got 1 rare and 1 common that all i got from those seals while other in my group who didnt even spend as much seals as i did already have 2 or 3 rares and all commons.... Or its just my plain luck :D
yes you should be close to a second rare, but the 1 common? are you doing single pulls? if yes dont do it always do 10 pulls you get 1 ninja in every 10 pull you do
sometimes u get it in 50 sometimes 60, but i always get it every 60 pull. so i think ur next 10 pull will get... but thats based on my experience alone though dont take my word for it