Apparently Nonu was excited about his return to the Blues but we found out about that sentiment yesterday only in a statement rather than in person.
Why would Kirwan be delighted, why would he be enthused about Nonu's return to clutter the midfield options, why would he embrace someone who'd stiffed the franchise a year ago?
Because the NZRU said he would and because Kirwan knows Nonu is such damaged goods at Super 15 level he will need to pull his head in next season. And because no matter Nonu's truculent behaviour, he is a world-class player and the Blues should benefit from that playing pedigree.
What guarantee is there Nonu will fit in?
Sonny Bill Williams is not playing 2014 in New Zealand which leaves the raw Francis Saili and Ryan Crotty to challenge for the black No12 jersey.
After 85 tests, Nonu brings a test pedigree they cannot match. He has played 133 Super games as well in a decade of professional rugby.
Originally, Kirwan and Nonu cleared the air several weeks after the midfielder reneged on a handshake deal to stay with the Blues this year.
He and All Black prop Tony Woodcock went to the Highlanders and are now both returning.
"I reached out to him five weeks ago. I think I made some mistakes last year and it was important for me to reach out and see if Ma'a was interested in coming back. I have always been excited about coaching him and still haven't done that," Kirwan said.
"For me it was seeing if he was interested in coming back and seeing if we could start creating a relationship."
Kirwan said he'd been told Rene Ranger would be a problem but he had been a great leader and outside back for the Blues.
He hoped that situation would repeat itself with Nonu.
Kirwan wanted more depth in his squad for the 2014 campaign and that would show when the group was revealed next week. They were still looking to nail down an outside back and some of the wider training group.
He did not have any answers about the disparity in Nonu's form in the Super 15 and for the All Blacks but wanted to create an environment where he would express himself.
The NZRU had not insisted the Blues sign Nonu and Kirwan said he did not operate that way.