[DrTiTus]

That's cool but no one signed up to co-governance.
The clue is in the fact those words aren't used.

Continued authority over *their* (o ratou) resources [those which they possessed] was granted. Not authority over *all* natural resources. One Maori chief did not have authority over another Maori chief's land just because they were also Maori and were somehow magic guardians of natural resources. It's a simple recognition of property rights.

It was reassurance that they could still run their shit /while they owned it/, but once it was going to be sold the Queen had dibs. Immediately after describing how they had authority over the resources they possessed, it detailed how the Queen had first option when they wanted to sell (dispose of - no longer possess) said resources. If the connection was not made between ownership and authority and dispossession/relinquishing authority, then that's not our problem 150 years later.

Clearly now they don't possess all resources. No possession, no authority. Any land/resources that are still in their possession, are still under their authority. But there's no magic "therefore co-governance" just because once upon a time property rights were mentioned over resources that they valued and possessed which they still value but no longer possess.

TLDR: All they signed up for were property rights.