Kakashi will need kamui to defend vs Susanoo's Arrows. If he missed just once Sasuke will Kill him quite easy.Kakashi and Minato.
Minato can take care of Naruto then aid Kakashi with Sasuke.
If it were KM or BM Naruto they would win.
I hate to say it but Kamui is a huge factor, it could one shot either one of them.
You go to the principe that Susanoo's activation and cast is faster than kamui wich is false.Both can attack first.Sasuke need to defend vs kamui as well.Last time, Sasuke tried to kill Kakashi while Kakashi tried to convince him to stop.It's after that susanoo arrow that Kakashi realized that Sasuke was motivated and won't come back.Kakashi will need kamui to defend vs Susanoo's Arrows. If he missed just once Sasuke will Kill him quite easy.