The raggedness around the cup, tells you the direction of the grain. But I don't see how it tells you the direction of the break without factoring in the slope. The grain pushes your putt so it is something to be taken into account, but if there is enough slope putts can break against the grain. Can they not?
I know the grain generally grows in the direction of the slope, so down grain is usually also downhill, but I am not sure that is 100%, I have read that it sometime just grows to the West.
For me speed beats read 90% of the time anyway, but I am curious about your theory. Is it just a general rule based on the idea that down grain is generally downhill.
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