The group has decided to save its funds for a possible Environment Court appeal.
The Dunedin City Council heard from specialists in a variety of fields at a hearing that, if permission for a zoning change is not given, could end the project.
But much of submitters' evidence heard so far is beyond what the commissioners can consider, and expert evidence to contradict the council's specialists has been noticeably lacking.
Stop the Stadium has raised a fighting fund to oppose the project.
Elizabeth Kerr, a former chairwoman of the Otago branch of the New Zealand Historic Places Trust, resigned last weekend from the committee of the group opposing the stadium because of the issue.
Approached for comment yesterday, president Bev Butler said Ms Kerr, and another member both women declined to name, had been asked to leave.
Ms Kerr said yesterday she resigned because as a committee member of Stop the Stadium she was concerned the group was not pursuing planning advice early on.
"I truly believe in using professionals."
A group of seven people, including Stop the Stadium members, had got together to fund the hiring of planner Andrew Henderson, who is listed to give evidence at the hearing on Thursday.
Ms Kerr said she was involved in that initiative.
"Independent submitters in this group want some legal guidance."
An email from Stop the Stadium to members said after extensive consultation with planners, lawyers and people experienced with the plan change process, the committee decided not to engage a planner.
"We decided to conserve our funds for the possibility of an appeal in the Environment Court. We felt this would be the most prudent use of our members' funds."
Committee member Brian Miller and Ms Butler would appear.
Ms Butler said Mr Miller had experience of such hearings.
Ms Kerr said hearings committees like the stadium plan change committee had been "beefed up" because of the amount of Environment Court appeals, and there were now less likely to be grounds for appeal.
"It is a risk. No-one wants, and who can afford, large legal fees if we can get a lot done at this point?"
But Ms Butler said her advice was the group would be able to find grounds for an appeal. The fighting fund raised was "not enormous", and more would have to be raised for an appeal.
Ms Butler said she had never said the group would definitely appeal, and it was still only a possibility.
"We just need to wait and see the outcome of the hearings."
While the group had good arguments against the plan change, there was nothing that had "jumped out at us" as something that would definitely stop the change at the hearing.
Apart from saying the resignations had been asked for, Ms Butler did not want to talk about that issue.
