This exactly. He has a very good Transformer setup that I'm going to duplicate. The only reason I could see for the PI is if he used it to provide USB Host mode

This exactly. He has a very good Transformer setup that I'm going to duplicate. The only reason I could see for the PI is if he used it to provide USB Host mode or something similar - connecting the two long-term to extend their features. OR if he were programming the PI from the Transformer...