Jigen's Unique Jutsu and the Karma are Uniquely Powerful

This gives him a massive amp on top of what was likely formiddable power. Naruto fans will remember that multiple characters defined the ten tails' power as akin to a bottomless pit.

Why can Naruto defeat Jigen?

Naruto could've beaten Jigen with ease were he to use Baryon Mode that made an appearance later in the series. He also very uncharacteristically ran out of chakra. The Seventh could've summoned way more clones than he did as well.

Who is more powerful Naruto or Jigen?

Yes its been stated by Kashin Koji that Jigen is stronger than Naruto due to his Karma. After Kashin witnessed the fight between Naruto and Delta, He said Jigen is stronger than Naruto and the key to defeating Jigen is Borutos karma.