No no, not keep him as CoS, keep his CoS and dismiss Prittwitz. So if the CoS is going too, why not just promote Hoffmann, even if he is junior?
I'll reserve judgement, Groener has some issues with the economy in 1916-17 and made some poor choices of his own. So perhaps Eichhorn was good, so he'll do well, but was he willing to replace EvF?
Yes, understood now. However, answer already supplied.
Hoffmann was a dark horse yet, and a junior one as well. Age and rank wouldn't have mattered, had one known already he was a tactical genius. But at that time, nobody knew.
Groener was a GGS insider and had experience as divisional and corps commander. Whatever his faults may have been, his observations and comments are important.