Alex_Clive
am not really sure about this but didn't they seal of the Edo tensei reanimations during the 4th shinobi war without the reaper dead seal?
In the fourth shinobi war only the bodies of Edo Tensei was sealed, it was more of temporary immobilizing them, this is not a perfect solution, even if Fujin does try to do this, Orochimaru won't let him succeed, because just removing the seal tag is enough to remove the seals placed on the Edo Tensei.