Shiki's practically a canon character, I guess that's Luffy's first canon kill. Yay! I don't even know why I'm happy about it
Although he could've survived somehow, I agree with you, he's most probably dead. And damn, I had forgotten about the villain from Movie 4!
I agree about Bon-chan's death (even if it pains me
) and that Arlong is alive. He was confirmed to be alive by Hachi in the Duval arc, he says "Arlong and Chuu and everyone else was taken prisoners, I escaped and opened a takoyaki restaurant", remember? I wonder if the prison where they are can be seen in the cover story where he meets Camie...