Board Thread:Theories and Speculation/@comment-31338621-20190501030435/@comment-9782468-20190507112536

@Vlad, I'm prety sure it took him 3 years to develop the standard Rasengan. If that's not correct, please point me to the chapter where it says he failed to add his nature for 3 years.

He deliberately didn't use Sage Mode because it interfered with his fast paced style. But that doesn't mean he wasn't training to be better with it. But he was basically 1v1ing the Nine Tails Obito, so he didn't have time to even try, unlike against Juubi Madara where everyone was monologuing and Minato had lots of back up. Minato didn't use it in life because he wasn't good at it. But that doesn't mean he wasn't training to be good with it