Also I've been reading TWD for years before the show was ever created so to assume otherwise is somewhat offensive, especially given nothing was actually said really discredits anything I have. In fact, I think even suggesting Abe would take Nicholas's death is being ridiculous. Why would they take someone with one of the best deaths in the comics, give their death to someone else, and give them a pointless anti-climatic death instead? Kirkman already admitted to ruining Abe by killing him early, so there's not a snowball's chance in hell he'll let Abe off dying what is essentially a background character's death.
Right, and Abraham has PTSD too. And Michonne. And other characters. I'm not saying your idea is invalid, it's perfectly valid, but the problem is the idea that Sasha would do so without the motivation of Abraham's death. It's a matter of the timeline and how it needs to fit. Sasha's obviously found a way to move on past her losses, and 601 and 606 prove this. She's been with Abraham, trying to help him with his own struggles with PTSD. SMG has said Sasha wants to honour the deaths of Bob and Tyreese, and simply live her life and provide for a community. Doing what Holly did, without the death of Abraham is just nonsensical. It's reverting her character development. Something needs to set her off again in order for logic to apply, which is the death of Abraham. Your mentions of her volatile action were sparked from the recent losses of Tyreese and Bob.
Sasha could still get Holly's death and it's likely, she could bite any person, but Abraham will have to die before her no matter what. In the comic, Holly has a lot to gain. Sasha's survivor's guilt plays well if Abraham dies before her, and she's back to where she was. She wants Dwight to die, the man who killed Abraham. If Abraham isn't dead, does she just randomly decide to point the figure at them because they're assholes? Do you see what I mean now? I think this is more of a matter of understanding Sasha as a character more than understanding the comic source material, and I know both well.
Abraham being killed by Dwight or another random Saviour in battle works well to set it up. So that leaves the question of who Sasha will bite. Tara? Probably.
This might be a bit too predictable. Well, I've been calling all the deaths for a while, so it wouldn't surprise me at all if this comes into play. Personally, Tara receiving Holly's death then biting Rosita, while Abraham later dies in the final machete killings at the Hilltop with Sasha putting him down like she wasn't allowed to do with Bob, it brings everything full circle.
Also, Abraham getting Nicholas' death is as offensive as Sasha getting Holly's death, depending on your opinion of that. Because both are insignificant characters compared to the characters that will die in the show, speaking hypothetically here of course if the given scenarios occur. So really, I don't see your problem with that. And why would they do this? It's the war. They want to make deaths matter in the war on the show.
Edit: The comic had a problem with killing off two major players dying before the war even began. And then started killing off a bunch of minor characters. On the show, it appears to be the opposite. Minor characters dying this season repeatedly, then some of the more recognisable faces get the chopping block when things get really big. Abraham doesn't even have to specifically get Nicholas' comic death by the way. But have a heroic death before Sasha dies, which is all I'm saying.
To summarise, Abraham dies before Sasha in every regard. That's all I'm saying.