On Gn'R myspace and on Ashba's site it lists Ferrer as a band member, not Brain.
Isn't it safe to assume that Frank would be the only drummer during a tour?
I believe the Myspace page was changed quite a while ago to reflect the fact that Frank was on tour with the band.
Since then, Axl has said Brain is in the band:
Is Brain in the band?
Last I checked. Brain works on several things with Guns either from his home or in the studio.
/jarmo