See my previous post.
A drummer is the heartbeat of every single band.
Frank isn’t “talented” he’s average. And again, not a knock to him at all. You can’t tell me you’ve left any live gig with him playing going “damn the drummer is awesome.” All previous GnR drummers were immensely talented and added to the feel, live experience and recording process.
Brain was their all around best drummer. But from a kick your face in perspective, that spot goes to Matt.