Thank you both for purchasing and promoting my book, "Don't Repot That Plant."
In fact, I just now finished a half-hour radio discussion of my book on a San Francisco gardening program. (See my on this site for more information.) I am not a genius, but I have lived long enough to have had considerable experience with indoor plants. Having members here pose their plant questions, helps me keep learning.
Your Dieffenbachia does have a nice curve on its lower stem. The new pot will need to be large enough so that the stem can be set in the pot so that it is vertical and the lower portion will be set almost horizontally in the bottom of the pot. So it will need some extra width to accommodate the bend.