Let's refer back to the graph I took from Mees & James that shows the effect on development by Metol of hydroquinone OR sulfite OR ascorbic acid at pH=8.7. The effect of hydroquinone is nil. The line is flat at each development time. The effect of sulfite at each development time increases with amount of sulfite, levelling off at about 0.05 moles/liter. The effect of ascorbic acid is the same.
What was missing from this graph that cannot be deduced from it is the effect of both hydroquinone and sulfite on development by Metol at pH = 8.7. I do not see that treated anywhere in the volume.