This is indeed the crux of the matter. Any model of an extended electron is going to require that there are two simultaneous components of spin in order to satisfy the observations of the SG experiment. This by its very nature is going to seem un-physical. For instance, if we imagine a material spinning sphere we see a ball rotating about a single axis with two poles (and those poles being unavoidable as in the hairy-ball theorem) and there is no physical way that a solid sphere can spin about two orthogonal axes simultaneously. Logically it seems that whatever material that is spinning must therefore be more "fluid like" in it properties so that we at least might have a chance of describing some kind of complex motion that could manifest this observed dual spin while also maintaining the observed isotropy of the electron as a whole. While QM seems to accurately describe atomic and sub atomic physics it has nothing to say about the physical structure of the electron (a point particle) nor the origin of charge, inertia or mass. We are taught to trust that what we observe in the macroscopic world simply does not apply to the microscopic world and we should just "shut up and calculate", yet ironically if any theory of an extended electron forces us to stretch our understanding of what we observe in the physical world it is immediately dismissed as being un-physical and therefore invalid.
Also our experience with charge is at the scale of the electron and above. We say that the charge of an electron "-e" is a fundamental constant and, with the exception of quarks having 1/3 or 2/3 charge, all observed charges must be integer multiples of this elementary charge. We don't know the origin of charge or even how to deal with smaller charge components that might perhaps make up the smaller pieces, if any, of an electron. The electron we call a fundamental particle, yet again, ironically, at the same time we know that uncharged photons can be combined to create a charged electron and positron pair and likewise the "fundamental" electron can be annihilated by meeting a positron back into uncharged photons. This offers another clue that perhaps the “fluid” that might make up an extended electron is electromagnetic radiation and that it can somehow be configured to manifest charge as well as the observed spin properties of the electron.
So if the current pattern of an orbitsphere is generated by this complex construction of great circle elements then at a single point on the sphere, the scalar component must be additive but the vector component must not. IE they must pass through each other and superimpose. We know that electromagnetic energy can do this and we can observe that photons for instance ( a particular form of EM energy) don't bounce off each other (ie their vectors don’t change) but they do superimpose.
On the issue of non interaction of the great circle loops that comprise the current flowing at any point of the surface of the orbitsphere here is what Mills has to say about it: