The elevation of Anshu Jain to co-chief executive of Deutsche Bank was always going to leave the bank with a high quality problem - but a problem all the same.

And the bank's solution, in the form of the restructuring of senior management and succession plan that leaked out this week, shows the extent of the conundrum that Jain and his co-chief executive Jürgen Fitschen have been grappling with for the past few months.