Drakewalls is a funny one.
There are 2 sets of plans 4733 (1890ish) and R63 (1857)
Names of shafts quite often get shuffled around, renamed and sometimes things like "shop shaft" (near a blacksmiths) end up nowhere near the blacksmiths, etc. Sometimes shaft uses get shuffled around. For instance, if you lookdown Lovelace Footway shaft at Consols, you might wonder why it is about 10ft x 6ft, rather than a snug footway. This is perhaps the case here.
From the top of the hill to the bottom (just below the stamps) and ignoring shafts which are on deep adit (not on the section) you have Brunton's Footway, Brunton's Engine, Machine, Footway, Webbs, Matthew's and Stamps Shaft.
The later section appears to show several shafts have gone missing and Footway Shaft has become Engine Shaft. Since Webb's Shaft and Footway are separate on the earlier section and Footway is shown as being the deepest shaft on the sett, as well as the waterwheel gubbins, it would suggest the earlier footway was being used as a flat rod shaft and the size of the shaft on the section suggests it had been slashed out from it's original size.
The later section shows Brunton's shaft only going to deep adit, machine shaft just below shallow adit and not being labelled. Webb's has disappeared, as has stamps shaft. It would appear that most works were around the deep section of "engine aka footway shaft".
Levels wise, it would appear that deep adit is about 60 fathoms deep at "Footway/Engine" shaft (from surface) with the old adit at about 15F from surface and "tye level" about 10F below that. There is (was) stoping to surface from Brunton's engine shaft to within about 8F of engine shaft (footway). Then there is a bit of stoping to surface around stamps shaft. I imagine these were referred to as "upper and lower gunnis" the upper one being the most spectacular and the one which was used as a bin in recent-ish times.
Without resorting to diagrams, if you take the distance between Webb's and Vent Pipe (matthews shaft) footway aka engine is the same-ish distance away from webbs uphill and stamps shaft the sameish distance way from Matthew's (downhill).
Either way, it's a very interesting place. It's a shame the upper gunnis was used as a bin. The section suggests that if you could get into the majority of it, it would be a boat job!