I honestly don't know if they've lost sir Rikudo chakra or whatever, but there's no way they're still the same tier as their valley of the end fight. Naruto still hasn't pulled out truth seeking balls either. I like it, seems Kishi has put them back to a more realistic and tolerable power level, instead of just God tier like before. Which is why i thought Gaiden would be pointless at first, since these shin guys and their "Shisui" master would have been light work if it was RSM Naruto and Rikudo Rinnegan Sasuke. At the moment, they feel just as strong as Hashriama and Madara at this point in time.
Edit:
Just a little nitpick but good grief Naruto, I swear he can't fight without Kurama at all. One of the things I was most excited for with this new Gaiden was seeing base hokage Naruto, but it's quite apparent that his fighting ability in base is just like when he was a kid... Non existent. Using sage mode to sense kids, using BSM to stop kunai. Even sasuke wih 1 arm isn't pulling out Susanoo yet. I bet Naruto uses chakra arms to wipe his ass and watch his back :|
Edit:
Just a little nitpick but good grief Naruto, I swear he can't fight without Kurama at all. One of the things I was most excited for with this new Gaiden was seeing base hokage Naruto, but it's quite apparent that his fighting ability in base is just like when he was a kid... Non existent. Using sage mode to sense kids, using BSM to stop kunai. Even sasuke wih 1 arm isn't pulling out Susanoo yet. I bet Naruto uses chakra arms to wipe his ass and watch his back :|