I'm curious if this actually tells us anything about the quality of the reviews, though? You could easily surmise that you make some basic comments on structure and some patterns in a file and send it back to the coder with a general "take that advice to the full change, let me know when I can look at it again."

That is, it isn't necessarily the case that the other files weren't reviewed. Just any overarching comments could have been left as an exercise for the coder. No?