Does anybody remember those small pills/bonbons from the old episodes that were said to drastically increase one's Chakra reserves and enable one to continuesly fight for three days? 
It would seem Kishi forgot about them. Why wouldn't everyone eat them before a fight? Maybe the alliance, including guys like Kakashi, ate them off-screen. That would at least explain some character's imane stamina.
Anyway, it's true, there are by far not enough important deaths in this war.
Temari most likely died, if one wants to consider her important. As far as I remember she was still alive after the meteor, but was never seen again after Madara used Kourin Kajukai.
It would seem Kishi forgot about them. Why wouldn't everyone eat them before a fight? Maybe the alliance, including guys like Kakashi, ate them off-screen. That would at least explain some character's imane stamina.
Anyway, it's true, there are by far not enough important deaths in this war.
Temari most likely died, if one wants to consider her important. As far as I remember she was still alive after the meteor, but was never seen again after Madara used Kourin Kajukai.