You can't derive story rank from timestamp and point score alone—the system is more complex than that and includes many countervailing factors, including user flags, software downweights, and moderation downweights. All of this is to try to prevent the front page by being dominated by the few hottest and most outrageous topics of the day, which is what would happen without them. I've reduced one downweight, though, so this one is back on the front page now.
There was a huge thread earlier about the rank of this thread and related ones relative to others, which you'll find somewhere in these pages.
