Yes, you mean the Ia of 1.Pz.Div.
Normally after attending a Generalstabslehrgang they would have beeen used in Ib and Ic positions to get practical experiences. It is possible that they were not fully convinced about his abilities so they ordered him to take a time as divisional Ia after being alsready Korps-Ia.
If his Beurteilung would have been "Nicht geeignet" he would been transfered to a frontline Regiment
By the way: thank you, I already seeked the first name of Balck's Ia