Okay, that makes sense then.
I don't know whatever Arthur was going through during the finale, but if he truly did pull out minutes before the performance, that's incredibly unprofessional. If it was an unpleasant environment, leave after you perform with a legend like Sheryl Crow.
Of course I don't think he should have been brought back in the first place, which is 100% the producers' fault with their terrible twist, so this is what they deserved for even doing the comeback in the first place