Not that it matters, but #6: https://kskedlaya.org/putnam-archive/putnam1999results.html

This whole rhetorical question/joke was a reference to "the comeback of all time" (also involving Colin Percival):

https://news.ycombinator.com/item?id=35079

#6 alphabetically, yes.

They don't announce the ranks of the top 6 because they want to just say that all the Putnam Fellows won without drawing distinctions between them.