The lineout is another area of concern for the Blues - a low success rate (79 per cent) combined with the fact Steven Luatua is by far their most used option.
However, one positive this week is that they will play a team with a worse lineout than theirs - the Highlanders have a lineout success rate of 78 per cent. The Chiefs' shonky display in their defeat to the Force in Perth has contrived to lower their success rate to 70 per cent - by far the worst in the competition.
If last week was about the effort Kirwan said was lacking in the defeats to the Bulls and Lions in South Africa, this week is about finesse and how they can provide opportunities for a backline likely to be reshuffled slightly with the return of All Blacks midfielder Ma'a Nonu.
There was a slight disconnection in the midfield against the Cheetahs once Nonu came off the reserves bench and pushed Jackson Willison to centre, but Kirwan was impressed with the latter, who kicked for space intelligently and must be confident of another start at Eden Park on Saturday night. George Moala, more of a finisher than a creator on attack, could find himself on the left wing in place of Tevita Li, with Frank Halai on the other and Charles Piutau at the back.
With Simon Hickey directing things, it is an impressive backline with potential to create serious problems from broken play, a traditional strength of the Blues.
The Blues are desperate to remain second in the New Zealand conference ahead of the third-placed Highlanders and they need only to look at their defeat in Dunedin last month to see how dangerous Jamie Joseph's men can be.
"They skunked us down there," Kirwan said. "It's a big night for us [on Saturday] and it's a big night for how the comp is situated from a points point of view."APNZ