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Kevin Cummings....that counts the most. After that it's probably just a matter of your own personal level of anal rententiveness.
I'm not so freaked out about wrinkles (creases that break the surface of the picture on the other hand aren't so great) or back damage (with the exception of skinning). For me, decent corners are high on my list, but if push came to shove and I had the opportunity to get a card on my want list with outstanding picture clarity and all of the above faults, I'd probably grab it. These items aren't seen every day, so I'd be taking while the taking was good.
I don't think you can have separate rules for 19th century cards, because that then opens the door for scads of separate rules for other things, but simply a low technical grade from any reputable grading company probably wouldn't prevent a true collector from grabbing an Old Judge card they needed or wanted.