Originally Posted by 999Ghosts
Well we don't really know if Oro even tried to summon Yondaime.
In the manga a third coffin appeared but was stopped by Sandaime.
But as far as I can remember that didn't happen in the manga.
Sandaime thought that another coffin with Yondaime would appear and did some handseals.
But no coffin appeared so it's possible that Oro didn't even try to summon him and Sarutobi just thought he would.
The thing is that we know too little about the whole sealing deal you are talking about. So it's hard to speculate about it.
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"