This fight is misunderstood. Kakashi and Obito are relative!
The only evidence for Obito “ throwing” this fight is when he tells Madara he had Kakashi stab him. This does not mean he wasn’t trying to inflict damage on Kakashi as well.
Kakashi was able to:
1- Blitz Obito with the raikiri when they immediately landed into the kamui world.
2- Kakashi reacted to Obitos Shuriken point blank with a mud wall outside the kamui realm, showing relativity.
3- Kakashi intercepted Obito lunging at Naruto with a shuriken with a raikiri before Obito could react.
The only evidence for Obito “ throwing” this fight is when he tells Madara he had Kakashi stab him. This does not mean he wasn’t trying to inflict damage on Kakashi as well.
Kakashi was able to:
1- Blitz Obito with the raikiri when they immediately landed into the kamui world.
2- Kakashi reacted to Obitos Shuriken point blank with a mud wall outside the kamui realm, showing relativity.
3- Kakashi intercepted Obito lunging at Naruto with a shuriken with a raikiri before Obito could react.