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
The teenager's family spoke of their "torment and pain" after serial killer Levi Bellfield finally confessed to her murder.
England and Wales could see drink-driving limit fall to 50mg if same measure proves successful in Scotland, minister suggests.
Aaren O'Connor, 25, did not know she had been shot and kept telling dad David "my head hurts" before becoming incoherent.