I would like to inform you that I have managed to grow a root from an immature cephalotus leaf. The leaf itself is no longer than 1 inch long and 1/16 inch in diameter. 1/8 inch roots are visible. This experiment shows that one can propagate from any type of leaf regardless the age. Also this goes against popular belief that only mature leves can produce new plants. I am also trying to propagate from 1/4 inch pitchers.
I don't know what is going to happen next. Theorically, if the leaf has a root, it is a new plant. How fragile or resistant will be to further environmental challenge is yet to be studied.