Circumstances can change, maybe his private life is in a different state now.
Joe would be undeniably valuable to the set-up if he came in.
It has, he was leaving Ireland to look after his mother in NZ after the world cup. She died before the tournament and he returned to Dublin. He said he wants 6 months or so off but is considering his options and that lines up well with taking an assistant coach role for NZ.
Joe got it wrong in his last 12 months here and we almost certainly overrate him because he's the only good coach we've ever had (even Gatland in his time here was raw and needed more time to develop) but his CV is mental:
11 - Heineken Cup
12 - H Cup
13 - Challenge Cup + Pro 12
14 - 6N, only loss in Twickenham, 2/2 in Argentina, win v SA
15 - 6N
16 - Beat NZ, SA and Aus in a calendar year
17 - 9/11 wins, record win v SA, Ended England's 18 win streak
18 - Grand Slam, Series win in Aus, NZ win.
He's the last guy I want in the NZ setup. If there's any criticism of them it's that they lack attention to detail against certain teams and can look rudderless when hit by surprise. With him at the helm they'll always have a gameplan and he won't be as restricted as he was with Ireland's slow distribution at 9, oftentimes poor hands at 12, and a non distributing 15.