this is hypothetically speaking of course.Kotoamatsukami doesn't exist now because the crow who had shisui's eye has been killed
yeah you are right ...thatz the speciality of kotoamatsukami that no1 realise that he/she is being controlled the victim will always think that they are doing everything with their own willno because it is said that the user isn't even aware that he/she is being controlled so the tailed beast wouldn't either.