Lycastes like that one (Lyc. skinneri/virginalis as a "majority" ancestor) are not completely deciduous if they are well grown, but they do lose some leaves. In fact, some people do pretty much dry them out in winier (I don't, but they also don't grow as well as they could) Having lost its roots, I'd suggest potting in small bark or sphagnum (basically just sit the pseudobulb on top of the medium because you don't want to bury the pseudobulb, you can stabilize it with two or three wood barbecue skewers ) Then just enough water to have some moisture in the medium - no roots means that it can't take up water. Those big pseudobulbs have a lot of reserve, so new growth - which will also bring new roots - should be occurring soon. For temperature, intermediate (try to keep above 50-55 deg minimum)
Lack of roots is because they rotted... if the plant is happy, it will have a good root system even when it sheds leaves. But if pseudobulbs are firm, it'll be fine.
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