Additionally, there was (supposedly) a second requirement to be eligible for standing back on retail vanilla (however, i do not know how we could test and see if this factors into Nostalrius, because I'm nearly positive the standing to rp ratio is not anywhere near close to blizzlike (For example: I don't think stacking players at near the same cp would yield a similar rp gain for those players as I have not been able to find any evidence of the sort from investigations done on retail).
In any case, I'll quote the original blizzard website from the way back machine on Auguts 4th 2005:
There are three steps in calculating and adjusting your Rank:
1. Excluding those with too few kills from the pool.
a. Those with less than 25 Honorable Kills will not be included in the calculations this week, and their points for the week will be 0.
b. A cut-off is calculated based on the number of Honorable Kills made by all characters of your faction this week. Those having less Honorable Kills than this cut-off (but at least 25 Honorable Kills) will not be included in the calculations this week, but their points for the week will be enough to at least attain or keep Rank 1.
Source:
https://web.archive.org/web/20050804023 ... guide.htmlthis essentially means (or should mean) that even if you get the 15 hks, you will get a standing, but you won't actually be included in the total number of players who achieved standing because you did not achieve a high enough ratio of your hks to the total number of hks earned for your faction.