Looking for trouble (and a specific image), I dredged up the long-dormant Steve's Baseball Photography site and found a few images that provided more questions than answers.
This shot of a Dodgers' minor league prospect was ID'd as Steve Armstrong, for whom I find no listing in Baseball Reference or the Vault. The latter did contain a couple of images of Dodgers prospect Dick "Night Train" Armstrong (seen below), who is not the same guy. Hoping there's a Dodgers expert who can pin down the mystery man.