The careful management doesn't end there, either. Kaino must be rested for two matches (not including the two byes) during the season, and it's here in particular that the 23-year-old Luatua must take a leading role.
Kirwan said of the rest plan: "I don't think that's a bad thing. Last year what we did which worked quite well was tell them [top All Blacks] to go away and come back on Thursday and still be available [for game in weekend], but this year the All Blacks want them to have the full week off."
Kirwan told the NZ Herald recently that he could have looked after Kaino better last year. After his return from Japan, Kaino missed the Blues' early trip to South Africa, but then played in the remaining 12 matches, with Kirwan saying his big No 6 could have done with a break.
It is a balancing act made slightly more problematic already this season by Blake Gibson's broken jaw and Luke Braid's recovery from shoulder surgery. However, Kirwan, who has at least three fit and in-form halfbacks to choose from in Jimmy Cowan, Bryn Hall and Jamison Gibson-Park, has been encouraged by the early form of 19-year-old loose forward Akira Ioane.
Luatua said his difficult times last year - he was castigated by Steve Hansen for poor fitness leading to a poor workrate - were eased slightly by talking to experienced players within the Blues.
"For me, just talking to some of the senior guys who have been through that before ... that's what gives me encouragement as well, knowing that some great All Blacks have done their time in and out of the team. Hopefully it's my time."