Hi William, the simple answer is, we wanted to present more options!

Anders has a different teaching style from Lisa and dives in to playing a little faster. Lisa goes further in depth with the function of the guitar etc. Anders course was never meant to replace Lisa's, it was to provide additional information presented in a different way. Nobody learns the same way so it is helpful to have multiple instructors that can teach the same topic in multiple ways. 

Lisa will ALWAYS be a member favorite and it is unlikely we will ever take her courses down. Additionally, Lisa's fundamentals course was older and was shot with a lower video quality. In an effort to keep the site as up to date as possible, we shot Anders videos in 4K.  

You can choose one instructor, or learn from both! Hopefully this helps clear up some confusion. Thank you for the feedback.