I'll buy that! Never considered that possibility, but you're right - who else would it be?
Right, that's the conclusion I came to when compiling my credits and essays years ago, although I don't currently have that one up on my website. I considered that it
might be Al, but Brian certainly came up with the riff himself, and it would've been just as easy, or easier, to pick up the bass and play it himself, than to take the time to teach it to Al. As far as the obvious pick sound on the strings...even though Brian has never been known to use one himself, remember that Bruce once told me that Brian would sometimes use his
thumbnail as a pick!