How has obito become so powerful

[Prime Rib]

madara trained him. sauske was able to become kage level withing 2 years? and madara is like 5x stronger than oro

 

[Wahidur]

madara trained him. sauske was able to become kage level withing 2 years? and madara is like 5x stronger than oro

sauske was good from the begining obito was weak

 

[Kira was Righteous]

Curse of hatred