By "owe" I mean that the credit for their success belongs to the group and not the individual, because the individual was merely a product of good circumstances provided by the group. I believe this is the sentiment intended by the "no such thing as a self made man" crowd--no individual is special, and anyone else would achieve similar things under similar circumstances. This ignores the fact that many others DO enjoy similar circumstances but achieve nothing.
Owing your success to something is not the same as saying that having the something guarantees success. I owe my love of Korean food to my time spent living in South Korea; others may live there and come away hating it.
I see - some attribute of themselves has set them apart from the ones who had similar circumstances but squandered the opportunity. I guess it depends on how fine you track those circumstances. Did they all have that super-supportive friend named Trey that always knew then correct supportive thing to say? Personally, I can point to many times in my life where a teacher, grandparent, pastor made overt attempts to derail me. Maybe I wasn't completely derailed, but it slowed my progress and may have taken me along a less successful track for awhile. Looking back, I'm surprised I've done what I have. But I do wonder what kind of success I might have had if those naysayers had actually provided support.