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JohnFair point Ed. I see 2 possibilities that could explain this all of which are wild speculation on my part, which is true for most of us as none of us have any first hand experience printing T206s.
#1. Perhaps the print shop had several printing presses in use, and the other machine was running the sheet with Starr, then it was laid on to the pile with the Collins card.
#2. Maybe that was the last run of the days printing of the Collins the plates were then changed incorporating Starr for the next run of the printing process, then the Starr sheet still wet was stacked on top of the Collins sheet.
We will never know for sure though. However the fact that we don’t have an uncut sheet does not make me think that some other process was involved with printing these cards. We have many uncut sheets from the era which represent similar style lithography printing.