Those decisions and a switch from centre to fullback for Charles Piutau and promotion to start at centre for George Moala have come as the Blues try to find some potency behind their pack.
Now Kirwan has hitched his faith to Daniel Bowden to guide his backline, a player who has returned after four seasons in the UK and Japan and has now recovered from a foot problem.
Bowden may be fit but he will need to be sharp to tune in to the pace of Super Rugby without any match practice and provide accurate goal-kicking.
The work of the Blues pack has not been the problem. They have delivered well in the set-piece and their loose-forward combinations have been a strong component of their work.
The problems are behind that group. They bring individual moments of potency but the combined flow of a garden hose suffering from several kinks.
Fixing that sporadic output is the domain of Kirwan as both selector and head coach. Some choices in his squad are making up the numbers, others such as Pita Ahki have been injured while the decline in form and favouritism of others like wing Tevita Li is baffling.
Those who watch training speak about a better flow to the backline formation who will attack their task of finding a win against the Waratahs. That hope has flickered but never left the Blues camp this season.
Promise and delivery are different components as anyone who has watched unopposed practice sessions will attest and if this latest reshuffle brings more of the same, the inquisitions will get worse.