Board Thread:Naruto Discussions/@comment-33953813-20180130130057/@comment-25122992-20180130135018

Well, both of them were pretty busy in containing Ten-Tails and then in fighting TTJ-Obito. In the proces, Minato lost one arm and already couldn't weave the hand seals for the technique anymore, while Hiruzen got a new concern by having to fend off Tobi and his wooden statue. So all of them had no chance to use the technique. Plus, it can be presumed that the jutsu stays as a suicidal one even for the reincarnated shinobi, since it seals the caster's soul as well (the reincarnated soul's sealing is one of the ways to undo the reincarnation itself), while Minato and Hiruzen had too many jobs on the battlefield to sacrifice themselves.