Pat
Again, I agree with what you are saying regarding the switching of subjects from press run to subsequent press runs.
Regarding the lack of Minor League subjects in the 48-subject Major League (ML) composition of the 1910 COUPON set,
my thinking is that ALC introduced the 86 - Minor Leaguers later in the process of printing the 350-only series cards. I
have always contended that the 48 ML in the 1910 COUPON set were from a very early (if not the very first) print run
of the 350-only subjects in 1910 (or perhaps as early as the Winter of 1909).
Then ALC started filling in their sheets with Minor League subjects mixed in with ML subjects later in the 350-only game.
TED Z
T206 Reference
.