I think it will be almost the usual lite foggy event Oda makes. Bith the supernovas lose to the emperors, but they are not killed, the emperors get the road poneglyphs so now the race for the OP officially starts with 5 players but Kidd and Law are already behind. The 3 real contenders are Luffy, Law and BB. If Oda has some balls he would have to use Law and Kidd to hype BB amd Shanks just to show they are above Kaido and BM for real. Afterall if either BB or Shanks really struggle with them then that means BM was stronger than them, which can not happen.