I'm sorry, but this reeks of denial. We don't know when the list was made, so that covers Greninja. "Guy" generally refers to a male human. Resetti and Nook aren't human.
The leaker obviously didn't know all the info at once. The proximity thing makes no sense as a detractor, and the last bit is inconclusive, as other series are also missing enemies (like Fire Emblem, Wii Fit, Animal Crossing, and I think StarFox). And obviously the staff wouldn't address the leak. Look, I get it, you dislike Chrom. But at this point you're just filled with too much denial to ignore the solid evidence because of a few minor "inconsistencies," if you can even call them that.
Anyway, I had a horrible dream that Frederick was shown instead, and was given a...different name. I think it was Jacques. Why did I have two Chrom dreams in a row?