With that score for the 1st time the whole Top-25 on that zone is filled with scores above 500 million. It would have happened already before, if the XBL scoreboards weren't reset at the very beginning, which made 2 scores disappear. Both Niterider88 and Jean Emmanuel already had a score above 500 million. Also keep in mind, that there are people out there who also achieved that, but they never submitted it to any ranking or told anyone on the internet. I am also pretty sure, that people copied strats from watching Youtube videos and also got good scores, but regrettably they never shared it.