From my own investigations, % development is based on some inscrutable combination of height and weight with a modifier for position. There's a pattern to it, but it's not a case of, say, being close to an ideal weight, because IIRC when I had a bunch of guys with the same height and different weights it just cycled through the values for development every 40lbs or so (so a guy would have the same development at 180/220/260/300/340/380/420 and so on)
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