Board Thread:Theories and Speculation/@comment-31266380-20170213121035/@comment-734582-20170213144717

Minato's use of Sage Mode is not unlike Naruto's first use of sage mode. He wasn't finished in training. Yes he can use the mode, but it's not up to par with his other abilities.

The main character isn't the only character developing new jutsu, but people blame Minato for not finishing his, even though he got a serious case of death preventing him from actually finishing his jutsu.