Kurama said Naruto was rusty, and the latter admitted to it. Naruto & Sasuke shouldn't have needed any motivation to sit Shin down with 1 good shot, considering them being demigods. Seeing as how it took Sakura 1 punch and all of 5 secs at the most to flatten Shin w/o killing him, the rust was certainly on the both of them somewhere.It is implied by Shin that the rustiness means there is peace therefore they had no reason to fight. There is a sense of comedy in all this, even when Naruto was Stabbed or Sasuke letting Shin escape. It feels they were just relaxing, just seeing where things will go in order to discover who was this Shin character.
They weren't Rusty, both are god like characters with huge amounts of chakra and resources to fight their enemies. The small amount of power they shown in the Gaiden was enough to defeat Shin and scare the hell out of little Shins. In Boruto the movie there was no rustiness, they just needed to be pushed a bit further in order to get serious.
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