Board Thread:General Discussion/@comment-28128661-20160404143233/@comment-4991168-20160404161427

There is a possibility that 'tis a mix of both.

The clear timeline for the series is never offered. We don't know how many humans other than Chara fell before Flowey got created. However, because Flowey was artificially created through the use of extracted Determination, it is quite possible he was more determined than most of the remaining six humans, yes. At the very least, if any humans fell while Flowey was already alive, they didn't take his ability to save.