yes, i supposed. kishi might show "kakyamruto" team first before the fight, then kishi will add shikamaru's ultimate team. kishi might show some actions but bit by bit.
but team shika, will be way too late.
I'm Not too sure that Naruto will be able to get into the Kage Summit, even if it is Under attack; But you could be right, maybe they hear explosions coming from the building and Try to race in and Help only to be too late.