Maybe aokiji is the one who dies
Pointless. His character arc is still not over yet.
We don't know why he sided with BB and what his true motives and goals are.
Killing him off now does nothing other than just waste a character with potential.
Meanwhile Garp is just an old man from the past era, and we've already heard all his tales and feats. Its time to let him go.
Only an incompetent author/writer would choose to kill off the former. Are you calling Oda incompetent?