As I see it, the serpentine coils and the independant coils would need the same number of nubs, i.e., one "set" at each location that the coils approach. I SUSPECT the same is true of porcupine quills, but I am not sure.
The only configuration that eliminates the large number of nubs or quills is the X_cusp unit and that can be made either with independant coils or with serpentine coils. So in reality, the real distinction between the two is how easy it is to cool, and that remains to be seen.
I reiterate that I like the X_MPG because it eliminates the nubs and quills and provides a minimal I/O set to interfere with electrons outside the MaGrid.
Just an opinion. It might not work out as I envision!
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