Thanks gentlemen. This is why the Forum remains a valued resource. I appreciate the clarifications.
Is the gluing of the half sole as opposed to stitching sub-optimal?
Aside from longevity (say the glue coming off), given that the gemming is stitched to the welt, in principle, so long as the sole stays on, then gluing could be fine as well without affecting the integrity of the shoe? I assume that stitching is more stable so in that sense, statistically preferable (i.e. less likely to come apart).
I didn't think to ask about the cork patching or replacing it.
This is all interesting theoretically, though practically more involved than I thought it would be: this will be my first sole replacement on decent shoes.
Is the best case a full sole/heel replacement with new cork?
@Chowkin thanks for the video which was helpful.