The report commissioned by Rochdale Borough Safeguarding Children Board (RBSCB) added:
Given the highly organised, determined and manipulative behaviour of the perpetrators, it would be unrealistic to imagine that their behaviour could have been predicted and that all harm to all the young people they abused could have been prevented.
However, had the sexual exploitation been recognised and responded to at the earliest stages, these young people may have been protected from repeat victimisation and other young people may also have been protected from becoming victims.
More top news
Solicitors acting for 20 of the families said they were "appalled to see the shambles in South Yorkshire Police" following the inquest.
The two men are accused of meeting with Mohamed Abrini and giving him money.
Two young women who developed blood clots linked to taking the combined contraceptive pill tell ITV News their stories.