As for Slingshot vs LF specifically...
I noticed the similarities of the Recoil and the Lyman before but not the bindings... interesting
I don't think anyone is necessarily copying anyone else or if any one could confirm other than showing dates of production, which still doesn't necissarily mean anything.
BUT for the sake of dates of production alone i want to say that i think "LF followed SS on the board" (they came out the same year so it is tough call, but i think the recoil graphic came first, correct me if i am wrong) and "SS followed LF on the binding" (the shane came out over a year before so that one is obvious)
AGAIN, i am just going by dates of release, not saying that anyone "copied" anyone else ;)
sorry for the long post ;)