That's it in a nutshell. If your drummer is off, well then the whole band sounds like shit. I thing Aerosmith has a legitimate concern. It's not like they suddenly don't like him. He's been sick and hasn't had time to rehearse.That's the problem, if the drummer is off the rest of the band will sound like shit. Aerosmith do not want to go on stage and sound like addled old farts.