For example-i read that Reinhard Suhren torpedoed a 5,100 tonne tanker, but it was abandoned and left to rot basically. Four days later, Erich Topp sights it and puts it under with gunfire, who gets the kill?

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"GARRY OWEN"-Traditional war-cry of the US 7th Cavalry.
"CURRAHEE"-War-cry of the US 506th PIR.
"Everybody thinks that they are going to get the chance to punch some Nazi in the face at Normandy-and those days are over, they are long gone"-Lt Chris Burnett

Suhren would get the "damaged" tonnage to his credit while Erich Topp would get the "kills" tonnage added to his tally.

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Lost are only those, who abandon themselves) Hans-Ulrich Rudel.