Wow...too many of my favorite artists have passed away over the last few years. Guru, Phife (and there's somebody else I can't remember at the moment)...now I just found out Sean Price died a year or so ago.
Arguably they can be for a minor spoiler as in there's a difference between Yamucha, Tenshinhan and Chaotzu die in the Saiyan arc, Aizen controls everything or the final boss of InuYasha is the sacred jewel and... Sanji fights a guy who creeps on Nami and Robin. Absolom turning out to be a zombie general isn't like the members of CP9's identities being kept under wraps. Hogback and Hildon being a bad guys are the only real thing that was at all intended to be misleading.
Our first real interaction with Absolom is his assaulting Nami in the bath. Not exactly a neutral position whether he was just some creep or actually working for Moria he deserved an ass beating and Sanji is the most likely to take that act personally. So I really don't see it as a spoiler but I'll avoid mentioning any future fights no matter how likely they are.