I'm not sure what you're arguing here...
I was pretty clear that he was in Spartan Ops. Are you saying that it's not fair that he was killed off in Halo 5? I understand that not everyone played SpOps, but to say that almost no one did is a bit of hyperbole don't you think?
There's obviously still a chance for him to be alive if we see the covenant infused with forerunner tech in Infinite, I for one hope we see it.
ha, that's totally fair man, I think they're pretty easy to find online, and everyone should watch them if they haven't in a while anyway, just to see how far we've come since then:
EDIT:
On the topic of Spartan Ops, I think this is what the future of Halo will probably look like, and maybe even what Halo Infinite could evolve into. Episodic, or maybe even continual stories, not unlike Destiny's expansions. A campaign that doesn't end, even after the Chief's story. Spartan Ops was both ahead of it's time, and poorly implemented. I'd love to see something like this again in the future if 343 can commit the resources to it.
Hell, if you watch the cutscenes, the story isn't even called Spartan Ops, it's called Halo: Infinity.