The Butler report shows the BBC was right to broadcast Dr David Kelly's concerns over the government's Iraq weapons dossier, Greg Dyke said.
Greg Dyke had to resign as BBC director general over the report
The former BBC director general told Channel 4 News Dr Kelly's allegations were that Downing Street had "sexed-up" the dossier.
That was the same as Lord Butler's conclusion that caveats should not have been removed from the dossier, he said.
Mr Dyke resigned over the Hutton report into weapons expert Dr Kelly's death.
Lord Hutton cleared the government of inserting material it "probably knew to be wrong" - including claims Iraq could launch WMD in 45 minutes - in the dossier. as claimed in a BBC report.
Mr Dyke said: "Dr Kelly's allegation was that Downing Street had "sexed up" the documents, i.e. that they had removed the caveats about the 45 minutes.
"We now know the caveats were removed. We are now told by Butler they should not have been removed.
"But nobody is telling us who removed them."
He said he thought a "number of people" involved in the production of the dossier would be "relieved they still had their jobs" following the publication of Wednesday's report, which found the intelligence case for the war in Iraq was "unreliable".
He said he did not think the report took the issue of his own resignation "any further forward", other than to show "the BBC was perfectly right to report Dr Kelly's allegations and concerns".
He added: "That's why I am not at the BBC today and that's why (former BBC chairman) Gavyn Davies is not at the BBC.
"I would defend that decision (to broadcast Dr Kelly's concerns) forever."
Andrew Gilligan, the reporter responsible for the now infamous 6.07 Today programme broadcast, said there was "ample evidence" the government had "sexed up" the Iraq dossier.
Caveats were removed and certain things were given more weight than they could bear, he told Channel 4 News.
Lord Hutton said the key claims in Mr Gilligan's story were "unfounded" and cleared the government of "sexing up" the dossier.