Why Sarutobi-sama had to prevent the fourth's Coffin from opening...

[Shisui Uchiha]

you just need to use common sense... and no he dosent need yondaime soul he needs living sacrifice soul ...

He needs a vessels body and the original persons soul. If what you said was true he could bring back an army of the strongest ninja... doesn't make sense. It doesn't matter what common sense says because it still is speculation. It wasn't shown, so it isn't true. You can't argue that.