Jonathan, I loved going through this course and plan to have my own character to share in the next few days based on what I learned in this course. I hope something along these lines is on the agenda for a future "Learning flow" as you're calling them and would suggest including some videos like the (now archived) topology overviews, which I found to be a helpful companion while doing the retopology during this course.
Just wondering, I know the Piero course touches on this some, but are there other course (here or elsewhere) that show how to set up a good facial rig, particularly for a human character?
Keep up all the great work!