So I thought you would only get the chance to get a Karambit Doppler if the items you trade up are in FN but I've seen people only use MW/FT items only and they hit Doppler Karambits, and in my unfortunate case it turned a FN only tradeup into a BS Rust Flipknife. So my question is can you just get any knife no matter what float it is in the tradeups or am I stupid and wrong?