if I follow it right?, that would be false.
the spin time is the strength of the MB to maintain it's pap after drilling.
if you notice that the phenom, animal, Unleashed ie. morpheus 2 cores, all have low spin times.
the core determines the natural tendances of the ball. you can drill a phenom to flip but it is less pronounced that the Unleashed.
Just my Observation and limited knowledge chiming in.
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"deserves got nothing to do with it."
-- William Munny