Gale ending plot hole

So there is something that has always bothered me about all of gales potential endings, why would he even be slightly worried about blowing himself up? He has a scroll of true resurrection just give it to someone he trusts like tara, his mother, elminster or possibly tav, blow up the netherbrain and just have your ally use the scroll to bring you back easy-peasy. Is there any in world/lore explanation preventing this I'm missing or is this just a slight oversight on larian's part?