He said communicating with investors had only been a small part of CERA's focus.
"If I think about my time there, I spent 95 per cent with real Christchurch people, and 5 per cent with that kind of person."
Sutton said CERA "fronted a lot" to Cantabrians, including at sometimes hostile meetings.
"We held a meeting with Port Hills residents over the zoning, and I think a lot of Government organisations would never have had the courage to front there," he said.
But he agreed that CERA could have communicated better about rebuild problems.
"It's difficult for the Government to give bad news," he said.
People in leadership roles naturally wanted to tell the positive stories of successes, he said.
Sutton said he had personally been told off for doing that by mayor Lianne Dalziel when he was chief executive of Orion, before he moved to CERA.
He had been making a statement about power cuts after the February 22, 2011, earthquake, and had focused on the 92 per cent of Canterbury homes the company had returned power to, he said.
"I remember Lianne rang me up and said, Roger, don't be such a moron. Don't talk about the 92 per cent, talk about the 8 per cent and when they will get their power on," he said.
City councillor Deon Swiggs, who started the Rebuild Christchurch website after the earthquakes to help people access information, agreed with the research findings.
He said CERA had not communicated enough information to residents, and had tried to only tell the positive stories.
"People lost trust very early on with Government in terms of what they were being told."
Dr Gjerde's paper also criticised the slow pace of the rebuild, and said it had been skewed in favour of those who were wealthy.
"Those living on the city's more affluent western suburbs were affected initially by the quakes far less than those living to the east. Since then, money and other resources have flowed much more freely in the west which has seen these areas return quickly to pre-earthquake conditions, whereas those living in the poorer central and eastern suburbs continue to battle toward recovery with far fewer resources to call upon," he said.
Dr Gjerde said his conclusions were based on Christchurch research findings, and comparisons with disaster recovery processes in other countries.
He hoped the paper, which was called Building Back Better, could be used to improve future disaster response processes.