However, he added that the public wanted the assembly to work more cohesively.
Assembly public accounts committee chair Darren Millar and several other members asked about the role of civil servants and why concerns were not raised sooner.
He said the biggest ever sustained investment in Wales and its public services meant the assembly would be able to honour the pledges.
You know them, they're the Assembly Government Sponsored Bodies, who used to be knows as the ASPBs, the Assembly Sponsored Public Bodies - or if you're old enough, quangos.
The investigator will be appointed by the assembly for the public inquiry process next year.
Mr Benfield was giving evidence on Tuesday to the Welsh assembly's Public Accounts Committee investigation into grants management.
The chair of the assembly's Public Accounts Committee, Michaela Boyle, said making a claim is often a last resort.
"It now seems unlikely that the cycle has been broken, " Auditor General Huw Vaughan Thomas says in evidence to the assembly's public accounts committee.
Appearing before the assembly's public accounts committee on Tuesday, Mr Sissling agreed with the "realistic and reasonable assessment of the scale of pressure in the NHS".
The job of the audit committee is to scrutinise the assembly's expenditure and ensure the assembly and other public bodies operate to the highest possible standards.
He says he has been overwhelmed by the public reaction to the Sunday Assembly and is exploring the possibility of setting up similar gatherings around the country.
Welsh Liberal Democrat AM Aled Roberts said the assembly's public accounts committee had heard of cases where the protection for whistle blowers in the health service and other public bodies was deficient.
BBC: Lesley Griffiths: NHS staff 'should report care concerns'
They are considering making a report to the assembly's public accounts committee - which scrutinises Welsh government expenditure - about "the manner in which the minister's office has behaved in this process with public money".
Ms Hutt said there were "lessons to be learned" from the report, but said the Welsh government was following "due process" by waiting for the assembly's public accounts committee to consider the WAO's findings before giving its response.
The board of governors at Cardiff Met has said it is considering making a report to the assembly's public accounts committee - which scrutinises Welsh government expenditure - about "the manner in which the minister's office has behaved in this process with public money".
She was taking part in a Welsh assembly debate about the public inquiry into the Stafford Hospital scandal.
BBC: Lesley Griffiths: NHS staff 'should report care concerns'
The Common Cause good-government group also seeks a public accounting of Silver and how each Assembly member votes on his leadership.
One group said the Active Travel Bill had the potential to be one of the most effective public health interventions since the creation of the assembly.
Last week, the Welsh Assembly Government decided to hold a public inquiry into the proposed site, which could handle thousands of tonnes of waste each year.
On Thursday a special joint session of the Rhode Island General Assembly is expected to pass comprehensive public pension reform, which will be signed by Gov. Lincoln Chafee.
Since the Welsh Assembly recently extended the list of public bodies which will have to become bilingual to include such outfits as the Student Loans Company (based in Glasgow), further compulsion might seem likely.
ECONOMIST: There are stirrings at the extremes of Welsh nationalism
But Tokyo-ites and the municipal assembly are livid that billions in public funds have gone to the banks to help them write off bad debts built up over years of bad management, and overwhelmingly backed the governor.
Baroness Randerson said the assembly was one of the few public bodies in the world that could set its own laws and spending agenda, but at the same time did not have the ability to raise tax revenue.
Dr. Sylvain Charat is a graduate from the University of the Sorbonne, Paris, was chief of staff for a former French Minister of Finance in the French National Assembly, and is now a public affairs consultant, specializing in the welfare system.
FORBES: In Socialist France, Investors And Entrepreneurs Are An Endangered Species
Dr. Sylvain Charat is a graduate from the University of the Sorbonne, Paris, was chief political adviser of a former French Minister of Finance in the French National Assembly, and is now a public affairs consultant, specializing in the welfare system.
FORBES: In France's Welfare State Status Quo, Are We Seeing America's Future?
Opposition AMs also urged the assembly government to improve the delivery of public services in rural areas.
Earlier this year, London Assembly Members narrowly decided to hold a public consultation on future plans, without involving the closures.
BBC: London fire closure plans: Authority votes against mayor
Mr O'Dowd claimed it was ironic that the DUP wanted to discuss security for assembly members but not for the wider public.
Wales Office sources point to examples of past confidential briefings to the Assembly group finding their way into the public domain all too readily.
Last week, it produced a report recommending that a regional assembly should take charge of most regional public spending and make decisions about economic planning and development, transport, training, health and the arts.
ECONOMIST: Why the North-West is getting keener on a regional assembly
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