| If you want to give it a better chance of growing, don't divide it.
The back growths, the older pseudobulbs contain water/nutrient reserves the plant draws on at various times like when it is starting a new growth. Cutting a plant in half then also cuts in half the water/nutrient reserves a new growth has to draw upon as it is starting and until it grows its own root system.
Dividing a plant to encourage growth is a bit like being on a long road trip, finding yourself getting low on gas and deciding the best way to ensure you make it to the next station is to siphon off half of your remaing fuel.
Also 2 inch roots seem a little small to my mind but 4 growths is a divisable size.
If you water in the morning, any water that is on the leaves will probably be dry by nightfall (if your air circulation is what it should be), and Cattleya alliance plants are not a prone to rot as are other types like Phals and Paphs. The exposed roots might do well enough with beign sprayed in the morning.
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