Who needs hand seals when you don't need hand seals. Naruto has surpassed using hand seals. You could say I. A way that his earlier versions of rasengan were like using hand seals when he needed clones, now he's surpassed that. Sasuke should be a 5 for hand seals as well. The Gudou dama have all 5 elements in them anyways, so in a way he no longer needs hand seals, and by the looks of it he can now infuse whatever chakra nature the Bijuu contain Ito a rasengan instantaneously. The rasengan is like a super charged version of any ninjutsu when it's infused with whatever nature type, and he can create one using a single hand.
naruto has transcended beyond hand seals.