Scot - I'm always up for agreeing to disagree but I'll continue to make my case as long as you would like to discuss it.
All 48 southern league subjects were planned with Hindu backs. The 1909 Hindu advertisements included the Texas league in its description, but none were printed.
The important thing the print groups do is to place the right subjects, into the proper production timelines. All 48 southern league subjects began production at the same time, and were discontinued at the same time. This is what makes them a single print group.
The fact that 14 southern league subjects were absent from the printing of a certain back isn't reason enough to split them into two separate groups. Within other print groups we see many subjects printed with backs others in the same group were not.