Earlier quoted context omitted.
I really like the multiplier vs adder differentiation. I would also acknowledge the solid global adders, as those who contribute to respectable open source projects.
Global adders, I would argue, are multipliers because high-quality software makes a lot of people more effective.
Yes, but that would break the meaning of the multiplier. That's why there is the global in front. So, global adder is a solid adder (or perhaps a rising multiplier) who regularly works on significant open source projects, e.g. webkit, apache, mozilla, etc.