OK, to be honest, you are worrying toooo much. Evergreen orchids tend to shed leaves when the new growths are starting. A normal occurance. Some yellowing or darkening of leaves on new aquisitions is normal, as the light conditions will be different from the previous. Small black/brown spots are not a worry. All plants may get them from
misting (water spotting from light) and the occaisional fungi. As long as they are non-spreading, there is little to worry about. Do be careful of sunburn, due to strong light. D. kingianum can take full sun, if given time to adjust. The leaves and stems will redden with anthocyanin, a kind of sun protection device. I try to avoid this, as it is, also, showing me the limits for that particular orchid.
Roots are best checked for life by wetting them. If they do not show a bit of green, then they will generally be dead and only usefull for anchoring the plant. Dormant and live roots will show green in a few minutes (chlorophyll). This species can take a prolonged rest, when the roots look quite dead, until they get wet. As Estacion mentioned, just leave them. Unless they are actually rotting or in great surplus, they do no harm. This species is best in an open, hard substrate, such as coarse bark or lava (or both). The roots like air and drying is generally positive.
My plants often look a bit ragged after a Summer in the garden. Wind and insects will take their toll. They are, however, thriving and full of flowers in the Winter.
cheers, J-
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