Ring Gap?

my68barracuda said
Actually when I spoke with the KB on line tech he mentioned the high top ring location as being the reason for the larger top ring gap. He said that in operation the heat will cause the top ring to expand and the ring gap in
operation will have near the same gap as a typical top ring. The second rings gap installation recommendation is about the normal ring gap to bore size ratio.
It seems to me if the piston was expanding it would be the piston to bore size ratio that would be significantly adjusted and result in a larger piston to bore clearance at installation. And as the piston expanded it would take the piston ring with it and enlarge the end gap,,,

I guess he doesn't really understand his product totally. I have provided a photo of a KB on the left and a Mahle forging on the right. The KB has a top ring land of .280" and the Mahle .240". The Mahle does not require any additional top ring gap unlike the KB. If its placement and not alloy type as you and KB suggest then please explain. I'm curious now. J.Rob