I strongly recommend that in that case he should not die trying to use the Yondaime's Kamikaze Sealing Jutsu - since that jutsu would probably render the contract moot.
On the other hand, if someone cracks the shield then there would be no need for that sort of move. Gai and Kakashi would probably be enough to counter the two Hokage that Orochimaru's summoned (even if they're not quite at that level they would be able to keep them from hindering Sarutobi) and without them, Snake-lips wasn't doing so well.
D for Drakensis
You're only young once, but immaturity is forever.
On the other hand, if someone cracks the shield then there would be no need for that sort of move. Gai and Kakashi would probably be enough to counter the two Hokage that Orochimaru's summoned (even if they're not quite at that level they would be able to keep them from hindering Sarutobi) and without them, Snake-lips wasn't doing so well.
D for Drakensis
You're only young once, but immaturity is forever.