Alright Ryu, you've made it clear. There is no point in discussing the matter with you. You don't believe there to be any alternative. You think there is only one canon - the official canon, and nothing I say can change your mind regarding that. We can go on until Armageddon shows up and still be at the same spot because we'll never agree on one thing - can there be more then one canon? So I'll leave the decision whether to consider The Compilation part of FFVII or not to the other readers of the topic.

Then explain the point of bringing it up.
Kadaj's disappearance makes sense but Grimoire Valentine's don't. Grimoire can't just suddenly disappear like that because he is a regular person. When they die, they remain. At least in the original they do. Say hello to one plot hole, there are plenty others. Of course if I put more examples up you won't believe them since they're part of The Compilation, which in your opinion is canon whether nothing but unnecessarily retcon or not.

And btw,

"Because SE hasn't said 'there aren't two versions of the story' there are two canons". Errrr, no.
I can't tell anyone that from any official source no, but can't people see for themselves?