I was just browsing through the nomination list and noticed that the “add comment” link does not appear for every candidate. I have over 10k reputation so I guess that shouldn’t be an issue, and overall the selection of which candidates I cannot comment on seems rather random.
I first thought it was because of the age of the nomination, but just now a new nomination appeared and I could comment on it. Then I thought that I maybe need more reputation than the candidate, but apart from the fact that this makes no sense at all, it is not the case for one nomination. Also some of those where I cannot comment already do have comments.
Is this a bug, or is there actually a system behind this?