if bts grammy performance and Grammy in general , will be just like another XYJ performance, so nothing special and extraordinary.
Grammy has own director , no one will let big hit do what they want. BTS and BIG Hit would get some plan how the performance should look like and what they want from them. so I don't think big hit could do much there.
i can already guarantee that the sound technical problems will be (as you know they shot it on the roof) big hit has never been good at creating good sound, which makes their live voices sound even worse. their sound technique sucks, in almost every live performance it happens that their voices are too loud as music itself and you almost can't hear that beautiful beat of dynamite.
whatever:
good luck to you .