Patric Young = 6-10 + almost 7-2 wingspan but only an 8-7 standing reach??
That is like Jeff Green. Good size, great wingspan but lousy standing reach.
I don't know if anyone has already pointed this out (I haven't read through this whole thread) but it's important to take both the 'standing reach' and the 'max vertical leap' with a grain of salt because some players have been known to 'tank' the standing reach in order to exaggerate their vertical leap. This is most common with guards, but also happens with some bigs (who want to look more athletic). Both these numbers tend to be the least reliable when players have been measured multiple times.
The combination of the two, which will be posted as 'Max Vert Reach' is fairly reliable, though.
Otherwise, for static indications of length, plain old 'head height' and 'wingspan' are more reliable than 'standing reach'.