I don't think so, if it were so, Kishi would have placed someone else there, maybe Hashi, Tobi or Hiruzen?I am sure minato reacted to the scream like everyone
well he placed Minato there because he WAS Obito's teacher and the other Hokage don't know him.. maybe Hiruzen a lil.I don't think so, if it were so, Kishi would have placed someone else there, maybe Hashi, Tobi or Hiruzen?
or maybe he just heard an agonising scream...I think he sensed his chakra. - He sensed Naruto's while he was in Konoha-. Obito is not that far. He was his student. Maybe it's the reason he looks surprised