I shouldn't thing a slight retard to after TDC would hinder starting much. It's certainly safer than any significant advance. Still, my knowledge and experience is pretty much limited to the letter series, and I don't know a thing about the static timing of the earlier, manual advance mags.
Some of it just may be nomenclature, and I think that that was part of your question earlier. If a tractor with a manual advance was shut down while running then, yes, one would want to retard the spark from that setting to start it the next time, back to somehwere near TDC. Whether "near" means a slight retard ATDC, I don't know.
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