Brassocattleya Hawaiian Agenda Florida Winter new roots/growth, and sunburn?

[FL_Orchid_Collector]

So one of my mom's Mother's Day orchids this year was the Bc. pictured and the other was Brassavola nodosa, both from Waldor.

Upon mounting I found the Bc. was extremely rootbound, to the point that I had to cut the pot off to get it out and the roots were beautiful and healthy. The rhizome had two growing points, was obviously in need of splitting, the right place to split it was easy to see and it was starting to split already so I did, and gave each division its own cork flat. They lost almost all of their roots within two days, which stunned me but then I heard that this just happens to catts.

Several days ago, one division finally grew a root from the new growth, and now that root is anchored in the cork. I packed a little more sphagnum around both divisions to give the new root a bit more moisture and darkness and to try to encourage the new growth on the other division to grow roots. Well, I don't see any roots yet, but one of the eyes on an old growth came out of dormancy so I guess I have two points of growth on it now but still no roots! Is there a way to influence what a catt will grow next or do they just grow whatever they think they want?

Another question: For a couple of weeks I've been moving the orchids which want bright light and are movable out to a sunny spot after watering starting between 9-10 am but moving that earlier now to 830-930am and again at 6-7 pm if it's not raining. So far it's been just the Catts and Brassavola but today I put my Neos, Encyc. tampensis, and Onc. "Sharry Baby" out as well and was planning to include them in that routine. Are these spots sunburn, and if so why are other leaves not affected when they're in almost the same sun? Is it from water on the leaves combined with the sun?