I think the Metallica connection is what has Rob on their list. As far as bassist go I'd have to have:
Phil Lynott, David Ellefson, Roger Waters, Billy Sheehan, Jaco Pastorius, Terrence 'Geezer' Butler, Victor Wooten, John Entwistle, Lemmy, Dee Dee Ramone ( he was steady as hell), Jimmy Blanton, Dusty Hill, mMingus, James Jamerson, Larry Graham and Aston 'Family Man' Barrett to name a few ...