What major Mercedes reshuffle means for F1 charge

Mercedes' struggles under Formula 1's newest set of technical regulations have facilitated change in its ranks. James Allison and Mike Elliott have swapped roles ahead of the Azerbaijan Grand Prix with the former returning as Technical Director just 20 months after handing over the baton to the latter to become Chief Technical Officer. So what has led to the switch, why can Allison turn the ship around and what difference will the changes make?