Had monitoring been in place, young Moko could still be alive, Coroner Wallace Bain said.
Inspector Hurimoana Dennis and Sergeant Vaughan Perry face three charges between them but have pleaded not guilty at the High Court in Auckland.
The remains of Colonel Marmaduke Nixon are buried under the traffic island, but an online petition wants the memorial removed.
The offending including touching women on their breasts, bottoms and kissing them with his tongue.
Dr Lance O'Sullivan says the region has terrible socio-economic stats, and that can be changes by developing new generations of leaders.
Ngai Tupoto have started a public fundraising campaign to buy Motukaraka Island in Hokianga, which they say is a link to their identity.