First, massive RIP to Lance Reddick! Second, I'd imagine that Lance may have already recorded some dialog for The Final Shape expansion. Bungie, please don't just write/drop Zavala out of the game or re-cast him (his voice I feel was too unique). Instead, take this opportunity to work your magic and have him go out in-game in a badass blaze of glory doing what he's always done... defending the Last City. Let's be real, HE IS the Vanguard. Also, have Caital pay respects... it would seem very appropriate given that they've seemingly developed a massive mutual respect for each other as military leaders.
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I think their only option is to write him out without killing him off. Killing Zavala will generate major backlash and can be seen as insensitive. Killing a character cause the actor left is one thing, killing a character cause the actor died can be seen as -blam!- up. One of my clan mates had an idea where they have Zavala retire, Saint takes up the mantle of Titan Vangaurd and then Osiris takes Saints place as the vendor for Trials.