Dylan doesn't write like that. He's not the type of signer to put an exclamation point at the end of a salutation, and when he adds dates it's usually in the xx/xx/xx format. I'm not sure if Cesar Diaz, who was Dylan's guitar tech for many years, did any signing for Bob, but I knew him and he told me how he could barely get a scribble out of his boss. Maybe Bob was possessed by some kind of angel to sign something this nicely, but I don't think so. Your thoughts, Steve?