The spin time measures how much of an influence a mass bias will have when it is placed in various locations. It does NOT mean that the ball will roll up sooner. Spin time and the time it takes a ball to roll up are 2 completely seperate concepts.
What low spin times do allow you to do is to get the extreme angularity out of a ball or the extreme control that would not be possible with other equipment. Believe me, I have experienced this first hand as I have been able to take a heavy oil ball (weapon of mass bias), drill it with the mass bias in a weak position, and get a great piece for lighter patterns. I have another weapon of mass bias on the other spectrum, that is only good on a lot of oil.
I see no correlation in spin time and "rolling up too soon," as can be evidenced by the extreme angularity of the paradigm, the exception, etc. I don't think you quite understand what the spin time even shows a driller, and how it can be used to a drillers advantage to create balls that would not otherwise be able to come about.
In addition, you cannot seperate a ball into just its components and say "this core is never going to work, or this cover is never going to work." You have to look at the whole picture and look at each ball as an individual entity, seperate from every other ball that you're looking at.
In addition, I have neither seen nor heard any rumors of the one dying out at all.
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stanski