He killed Itachi’s friend making Itachi awaken his sharingan
He manipulated yagura the Mizukage and single handily turned the hidden mist into the blood mist during yagura’s reign
He helped Massacre the Uchiha clan with Itachi
Minato believed Naruto would need to master the 9 tails power to defeat him in the future. He was so strong Minato and Itachi both suspected he could possibly be Madara Uchiha.
Honestly I think yellow mask Obito is right below orange mask Obito. The reason I previously didn’t put yellow mask Obito is because I didn’t think the power gap was the that massive. Like @A Professional Idiot mk.2 said Other than just more experience he still scales to orange mask Obito. Orange mask Is a lot faster like being able to react to raikages punch during the summit, be fast enough to save Sasuke from a particle style and being capable of saving Sasuke while danzo had a sword to his throat. Orange mask Obito is a bit faster
P.S minato calling Pain one of obito’s pawn just being used is indirectly saying yellow mask Obito > pain.