"We need for you to please do two things. One, render irrelevant what is presently the single biggest block to progressing the Ngapuhi settlement by immediately removing Crown recognition of the TIMA mandate," the pair said.
The Maranga Mai report was produced by the Ngapuhi Engagement group - a tripartite group comprising the Crown, Te Kotahitanga and TIMA - which was established to address issues raised in the Waitangi Tribunal's report into the Ngapuhi Mandate.
TIMA had not yet stated its position on Maranga Mai but a spokeswoman for Mr Finlayson said he had no further comment to make other than what was said in his letter to Mr Sadler.
Now, Ngapuhi elder Kingi Taurua said he has been asked to call together a hui of Ngapuhi to discuss settlement issues as egos were getting in the way of what was best for hapu. A date and location for the hui is yet to be confirmed.
Mr Sadler said a meeting had been set for Fridayas the board needed to meet face to face to discuss several issues and said many trustees were unavailable before that date.
Mr Sadler said he had a problem with Mr Finlayson's threats to reassess the mandate but TIMA were not to blame for holding the process up.
"When you consider we were well on our journey before the [engagement process] came up. The [engagement process] was only supposed to take three months it stretched out to seven months," he said.
Ms Tuwhare said there were a number of factors which led to the decision to ask Mr Finlayson to remove recognition of TIMA's mandate.
"The fact is [Maranga Mai] is what our people want and if the board can't see itself as able to support our hapu and hapu rangatiratanga than the process and the board makes itself irrelevant."
Te Kotahitanga co-leader Pita Tipene said he supported Ms Tuwhare and Mr Napia.
"Our preference would be that Tuhoronuku on their own volition would agree with Maranga Mai in its entirety."