It seems some Panzerkorps have a Bolt - I came to understand that they provide passively a White Bolt.
The first question that came to mind is - if a 'heavy' PanzerKorp offers a bolt, why Panzerarmees don't?
Second comes a suggestion, that may differentiate further. Some units can have also a red bolt (as per a potential defensive shift too). I understand there are cards that give benefits to 'Elite Units', but SS armoured corps in general were high quality (whereas they've pratically standard statistics), and same is for the FHH unit (That whilst formed later on in the war, it was the Grossdeutchland corp. Pratically the cream of the Wermacht).
I fully understand that in a game with production where this or that regiment or division can conflux in this or that corp - there is a general standarization of units. But I believe some specific, quality units (at least for Germany) would add a helluva of chrome.
Third - while I understand in TITE the OOB may be fixed and strictly historical, in ETO Germany will have the capability to decide how to build their Panzerkorps (depending on their economics - probably an EP limit more than anything else dictating how many panzer divisions they can have and how many motorized, etc). [Example - they could build more panzerkorps than what they have for Barbarossa, or have more heavy ones with 3 PzDivisions, etc.]