I have 5. If you like them answer and add your own 
Will Rep folks who come up with question!
1) Why didnt Tobirama undo his own Edo Tensei... He had more than enough time
2) Why Sasuke never used Amaterasu against people who could not avoid it or survive it
3) Why didnt kabuto just re-summon edos to assist against Itachi and Sasuke
4) Why didn't 3rd Hokage simply destroy the roof and fall through to get out of the barrier
5) Shouldn't the Moon make Nara clan shadow possession stronger since the shadows are more vast and intense?
Will Rep folks who come up with question!
1) Why didnt Tobirama undo his own Edo Tensei... He had more than enough time
2) Why Sasuke never used Amaterasu against people who could not avoid it or survive it
3) Why didnt kabuto just re-summon edos to assist against Itachi and Sasuke
4) Why didn't 3rd Hokage simply destroy the roof and fall through to get out of the barrier
5) Shouldn't the Moon make Nara clan shadow possession stronger since the shadows are more vast and intense?