It does look like you have a new lead. However, I would repot this cattleya in sphagnum moss. When I first started growing cattleyas I had a few that reached this point and after a few months in sphagnum moss they started growing new roots. Just make sure the moss isn't packed tightly in the pot and let it dry out completely before watering. Even after you get new root growth keep the orchid in the moss for six months then you can repot it in a bark mix. Normally you wouldn't grow a cattleya in moss but this plant needs water and humidity. Another thing you should know is cattleyas need around 3000 foot candles. Your orchid had really dark green leaves. This means it's not getting enough light. Your grow lights might not be putting out enough foot candles. You can purchase a light meter for cheap at any garden store. Good luck!

-Jason