Oda's inability to let his characters die in peace is well known. In reality though things are much better now than they were 15 years ago, yet most people dont realise that.
In the east blue saga no one died. In arabasta no one died(not even mr 3 or pell). In skypiea enel burned dozens of people but somehow everyone survived(well lighting and fire cant do shit in one piece world so...)The same goes for ennies lobby, thriller bark, sabaody etc...
It was not until the paramount war that we witnessed the death of two important characters(ace and whitebeard).
Since then we had two characters die in Punk Hazard(vergo and monet), one in whole cake island(pedro) and otama's "father" in early wano. If kanjuro, kiku and asura stay dead i will be pretty satisfied with this arc too(i think more people will die too by the end of the arc). One piece gets darker and darker, year by year, so the only thing left to do is.. to trust Oda.