Their skill may have nothing to do with it, today artists have much more creative control than in the past. Alot of times an artists' vision and a producers' vision may be very different, and artists typically aren't receptive to others dictating to them how to create their art. Studio musicians just play what they are told to play

I think studio musicians are not credited so they don't recieve royalties...the play the session, get their union check and that's it

The concert was postponed due to Page breaking a finger