Hi Maura! While not addressing your Qs directly, logically, I certainly can throw in my opinion from my experience. All orchids or say 90% that are brought into my care enter some kind of a confused and muddled pseudo time warp and not all return/ adapt. As I have purchased orchids through year whatever the season the orchids generally hit 'halt mode' with varying time lengths. It is this that seems to dictate their new body clock.
While ambient temp, length of photoperiod often trigger/ promote orchids to react I can surely say with the season changes here that its the halt mode to acclimatize that makes the decision.
My catasetinae are specific in care routine etc so should expect growth in spring, leaf fall in autumn, flowering within this timeframe and then dormancy. Some induce dormancy with cutting leaves etc. I had the spring summer autumn lifecycle and i use natural available light. So these catasetinae had day length access and therefore the reduction in sun with current winter. The majority skipped dormancy and went str8 to spring mode and my grow area is temp steady and controlled all year but with noticeable lower temps at night!. Go figure!? No one can tell an orchid what to do in manmade situ but we can try/ infact try very hard!