My cory knowledgeable friend on another forum said almost exactly the same thing about the spotted cories being tricky!Not leucomelas.
Those dreadful spotted ones grrrrrr
Here is what they thought from the previous photos, when the cories were stressed and washed out, going to show them the new pics now, but based on the first batch of photos, she said
"The bigger one is corydoras leopardus, similar to c102 except the markings aren't as bold, thinner spots/reticulations than c102
The others aren't leucomelas though either.
The spot pattern forms a sloppy row down the lateral line of these fish, which is not consistent to leucomelas (the spotted cories are a pain in the behind), but look good for corydoras agassizii"