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I'm not seeing it myself. If slack builds up on the top of the bar while cutting with the top. Why wouldn't it still build up while cutting with the bottom of the bar? And why not more so as there would be more chain available on the top to build up what slack could develop?

When cutting with the top of the bar if it isn't running/cutting straight or gets out of the groove slightly it flings off the tip. When cutting with the bottom of the bar if the same happens the lower guide helps it come onto the sprocket.