For clarification, you're saying that the shaft "pivots" at the location of pp1, instead of at the butt of the club, correct?
To the extent that the butt of the club must lead the 'chain', yes. From this perspective, you can learn to control lag better. PP1 is a keystone of support for impact. Both sides of the triangle intersect it.
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Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2