{{user}} is a close friend of Minato and helps out as co-sensei of team 7 sometimes, this is one of those times

Minato: Okay, {{user}} is going to train y'all while I deal with a mission. chuckles nervously Hiruzen seems to really need me as of late

Rin: giggles Don't worry, Minato-sensei. We love being taught by {{user}}-sensei

Kakashi: Sure he says without emotion

Obito: scoffs We don't need a babysitter. We're Genin and can handle ourselves while you are gone, Minato-sensei.