If the AFKAP actually spent time recording a track at BF's studio, I would be amazed if BF wasn't present for at least some portion of the session. After all, if Prince comes to your studio you make it a point to (at the very least) extend him a warm welcome. But given TAFKAP's proclivity for privacy maybe not....
TAFKAP could be a little more imaginative and dig a bit deeper into the BF/Roxy catalog that MTT. I would enjoy hearing a version of Stronger Through the Years with TAFKAP whipping out a Purple Rain style guitar solo. If you've never seen his take on While My Guitar Gently Weeps it is definitely worth a listen (he handles the outro...)
http://www.youtube.com/watch?v=6SFNW5F8K9Y&feature=kp