Hello Antonio,
his name was Kohns ..., and I haven't put in Uffz. Kohns because I'm not sure if he really was the gun commander, maybe the gunner or maybe ..., just a crew member?
Reason for that is, that the Kriegsgliederung of s.Pz.Jg.Abt. 654 for 5.7.1943 with the Jägerführer (gun commanders) in the book from J.J. Fedorowicz shows Ferdinand "513" with Oberfeldwebel Helmold, while Unteroffizier Kohns is shown for Ferdinand "614".
Of course, the gun commanders could have changed over the course of the battle, even within the separate companies of the Abteilung.
Also, I can't find Kohns nor Helmold within the recipients of the Iron Cross 2nd or 1st class for 654, so ...
Maybe Ferdinand "513" had 8 tank kills, for sure as this is what the kill rings show us. But it could be that Ofw. Helmold had let's say 2 or 3 kills, than another commander joined after the wounding of Helmold, finally Kohns took over and had one or two kills (or none?), being pictured in front of his Ferdinand AFTER the battle.
Important:
Ferdinand "513" was from 1./s.Pz.Jg.Abt. 654, which ist = 1. of II./s.Pz.Jg.REGIMENT 656
1. Kompanie had 500 numbers
2. Kompanie had 600 numbers
3. Kompanie had 700 numbers
Finally, Peter Kohns: He continued to serve with the sister bataillon s.Pz.Jg.Abt. 653, from THAT chronicle I know that he had 1 KW1 and 2 trucks (still with Ferdinand a.k.a. Elefant tank destroyers, and on 22.3.1945 he destroyed 2 armoured cars with his Jagdtiger from the 653. So, of course he had some success, but I'm afraid he didn't have 8 tank kills during "Zitadelle" ...
Oliver