Anecdotally, I've shot a soccer ball and a tennis ball and find it harder to get a good motion. I've read this as a reason for Rondo's FT shooting. I'm not aware of any science either way, so as far as regurgitation, perhaps it's a two way street.
I had written and deleted a comment about how bigger guys don't shoot as many outside shots, which seems like a factor.
As an aside on hand size, this is freak of nature type stuff.