another way of comprehending is not covering but rather pointing at the base extension of the plane line....kinda like if the shaft extended as you go back...it would go from say 45'' long at startup too 60'' a couple of feet in the backswing, does that make more sense? that way if it extended for real, even if you are in an arc, the extension would still be covering the line.
I can understand that you could be tracing the alternate plane line, but as I remember Homer specifically refers to the clubhead covering the alternate plane line and he usually meant what he wrote. I didn't see how the clubhead could ever cover any plane line except maybe if the club was on a completely vertical plane.
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