I think it was simply a matter that the eastern front was shrinking, meaning that one Army HQ was not needed. So Pz.AOK 2 was shipped to the Balkans for anti partisan duty under command of Lother Rendulic (hardly a panzer commander). They took no panzer troops with them, so the move didn't effect A/G Center in that regard. After they arrived in Belgrad they were assigned to H.Gp. F with the following attached:
LXIX.Res.K 187.Res.Div., 173.Res.Div.
XXI.Geb.K 118.Jg.Div., 100.Jg.Div., 297.ID, Gren.Reg.92 (mot.)
XV.Geb.K 373.ID, 114.Jg.Div., SS-Geb.Div."Prinz Eugen", 369.ID, Jg.Ers.Reg.1
III.SS-PzK, SS-PzGrD "Nordland"
Hope this is helpful.......Jerry
When you're in command..... command!