There’s no rule that says you can’t sign up for multiple courses on different sources, and take instructions from more than one teacher. While I found the B2B course very helpful as a beginner, and Josh to be quite the character, Mark Smith has a different approach, plus teaches many things that are absent from the B2B course. This statement is not a criticism in any way, it’s just a fact that every instructor teaches differently and focuses on different things.
The main thing that I get from Talking Bass is a great deal of music theory, which I feel is important for me in my quest to become a musician, not just a bass player. I am very happy that I invested in the Bass Buzz B2B course, and equally pleased to have purchased many great courses on Talking Bass. When Josh launches an advanced course, I will not hesitate to buy that as well.