No success on clarifying Old Masters, or tying Brett to ALC more directly. I did find some stuff on ALC registering numerous cigarette brands, none of which I have heard of, in a compilation of 1911 issues of The United States Tobacco Journal (
https://books.googleusercontent.com/...BbP1Evfh_PuOvw). One of the brands is "Lady Derby"; Derby was of course an issuer of T59 and a tough back, perhaps an off shoot of this brand?
If Fullgraff, ALC and Brett were doing everything the evidence thus far indicates, it begs the question of what the ATC actually did beyond pack and ship cigarettes. So many of the functions of a businesses processes and growth, R&D, marketing, etc. seem to be happening from the lithographers and Fullgraff who may or may not have been on their payroll too.