Deputy leader Grant Robertson, who had held the environment portfolio, is now in charge of employment and training, thus harnessing one of Labour's best and brightest to what is shaping as the No 1 election issue - jobs.
The switch also ups the ante on National by making a potential future Labour leader face off with a potential future National leader, Steven Joyce. He has largely had an easy ride until now. Robertson nobbling Joyce would be a major scalp for Labour. But vice versa for National.
Likewise Annette King and Tony Ryall in health. King had barely had the role for five minutes when she lashed into Ryall.
It is not so much the case with Chris Hipkins in education. Hekia Parata is already beyond redemption in most people's minds.
Shearer's clever reshuffle also makes use of two other long-serving, but highly effective MPs. Phil Goff has been given licence to make trouble for National across the whole public service - rather than just the Ministry of Foreign Affairs. Similarly, Trevor Mallard has been given the shadow internal affairs spokesmanship which covers issues such as ministerial travel and credit card spending.
Where Shearer has demoted MPs - except for Lianne Dalziel, who falls out of the top 20 - he has shunted them down only a few rankings.
He has also made it pretty clear to Cunliffe that there is a road back from the wilderness.