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It has to do with purification of that part of the body which it illustrates. Spinal kundalini arousals and flushes concern mostly just that, the spine and the head of the subtle body. It does not necessarily target any other part of the body. Therefore once sushumna nadi is flushed and keeps open, one will find other areas which required flushing. Then one by one, the yogi can get these areas cleansed of stale energy, so that the entire subtle form is flushed clean.
After snow plows or commercial sweeper trucks tackle the main roads of a city, they focus on the small back streets and dead end roads which remain clogged.