I'm getting much faster root growth than I expected. Extremely healthy foliage, and budding has been consistent.
I did, however incorrectly identify the third tree as a variegated F. benjamina. It is actually a Ficus triangularis. So some more research is required to ensure I am giving it proper care. I removed the leaf with the brown spot. Not sure if it was disease or burn, but as it is overall very healthy, losing one leaf isn't going to hurt it.