@cramej Thank you for this.
#2 is probably 1.25" h x .75" w (I do not have exact dimensions for it). I agree #2 is probably a duplicate. Could they go from tintype, ambrotype, daguerreotype, fartface-type etc.
to these "cabinet card" printings we see in the album?
At the end of the day, our goal is to try as best we can to validate the names in the captions. i.e. are these the people the captions say they are? I think the distant cousin, and most certainly myself, are very concerned about this. I personally want to scrutinize this process, and I don't care if doing so will take years.
I concur with all thoughts you bring up here, perhaps less the (very real) possibility #2 might have been cropped. (Reason: it's dimensions as mentioned above.)
Your information is very useful. Thanks again. Thoughts from others most welcome too!
[edited for clarity]