First off, if you are getting results and enjoying the process think long and hard before adding something that might not help and might hurt.
Second, I believe some of these suggestions are a few years old and things change and evolve. Normally these days 3 assistance categories are recommended for each day (push, pull, singleleg/core). With a template like BBB you will need to cut back a little on assistance work. Jim has already answered similar questions regarding BBB if you do a quick search.
Finally, if you do the search and find your answers, don't just add a ton of stuff you haven't already been doing. Starting light and progressing slowly doesn't only apply to the main work.