What is it? I never heard/read of his standing reach, tbh.
The other components that play a factor in standing reach besides height and wingspan I suppose would be neck/head length and shoulder width. If you have a short neck/head, your height from shoulders to floor is relatively higher than your actual height; and if you have narrow shoulders, your standing reach should be longer than what your wingspan indicates.
It's weird though, because Keldon seems to have some wide ass shoulders, tbh.
And it would have me at the forefront, tbh.