Obito was only 14 at the time yet many act like he would have Kage level skills. Sure he trained with Madara for months but he was a Chunin so his skills should be on Jounin level with his Kamui. Minato is strong enough to fight a Kage level (A) ninja and a above Kage level (Bee with 8 tails) ninja on more than 1 occasion. Minato wasn't even in SM yet he took down Obito and is the only one to figure out how Kamui works as fast as he did.
