To use Blank's framework I suppose business development carries on the customer development role assuming a feedback channel to product development is in place. This is especially true for enterprise business development where a sale can be a 2-12 month, detailed discussion about needs.

However, I note you don't really mention customer development as something you did in your original post. It sounds like you basically did sales, which though a huge job is in Blank-land something that doesn't take the customer's feedback and use it to iterate the product itself. So, maybe you need to rephase what you did if you did what Blank calls customer development.