The Crusaders are moving along quite well with Colin Slade running the backline and backup from Tyler Bleyendaal or Tom Taylor. That is an abundance of talent and choice for any franchise.
Carter wants to resume Super Rugby with the Crusaders after the June test series, but that will create dilemmas. Others who have settled into a groove and team patterns will have to make way, presumably, for an eager but rusty Carter.
Until he is ready to play he can help mentor the Blues squad's five eighths Simon Hickey, Chris Noakes and Ihaia West as he continues his lengthy rehabilitation from a range of injuries.
As Carter gets back into the training groove with the Blues it will also allow him to work alongside All Black backs Piri Weepu and Ma'a Nonu while guiding others like Charles Piutau, Francis Saili and Frank Halai.
The Blues have not been able to settle on a five-eighth since Carlos Spencer left.
When Ihaia West was confirmed in the group, that rounded out to 20 those who have played five eighth for the Blues since Spencer left in 2005.
Think Tasesa Lavea, Luke McAlister, Orene Ai'i, Isa Nacewa, David Holwell, Nick Evans, Isaia Toeava, Jimmy Gopperth, Stephen Brett, Daniel Kirkpatrick, Lachie Munro, Michael Hobbs, Gareth Anscombe, Piri Weepu, Chris Noakes, Marty McKenzie, Baden Kerr, Hickey, Marshall and West.
Senior players benefit from the extra stimulus as they come towards the end of their careers and a deal to sign on for the Blues as a player-backs coach with Graham Henry leaving after this season, might be just the boost Carter needs to carry him through a few more campaigns.