I have a Niro EX-Special. Last week I noticed the black weatherstripping on the back passenger door window (it is on the frame) was coming loose. This week it flew off (so now there is just the chrome). My question .. does anyone know if that black covering was for cosmetic purposes, or if it actually was serving some useful purpose (like a form of weatherstripping). I am tending to think it was just cosmetic. Thanks in advance!