Amon and Haedo's possible future(spoilers sort of)

A qoute from someone involved with the HH series (wether it was a GW or BL honcho, I don't know) was that we only thought that we knew what happened at the climax of the HH. This suggests that many things could change, or maybe only a few, but very important, things.
We know that Emperor will kill Horus. Maybe, however, they'll take the fluff back to an earlier version an re-instate Olianus Pius, the Guardsman who died by Horus' hand who was replaced, in later fluff, by a nameless Custodes.
I don't doubt there will be a load of complaining at any change/percieved change in the fluff, but I'm excited to see what is going to happen that we don't know about! One thing I do like though, is that the last person Horus kills, the act the clears the Emperor's mind, is nameless. It shows that, in the end, Horus is acting for himself, whereas, whatever his methods may seem to show, the Emperor really is thinking about the vast billions of people out there in the galaxy; why else would he be so incensed by the death of someone so anonymous when his son, Sanguinius is lying dead by Horus' hand?

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The Emperor didn't need to see Sanguinius die to know what happened; they are father and son with a connection deeper than anything anyone merely human has ever felt. For Horus to kill his brother, he would have brought to bear power, focussed his mind and strength and turned to kill a fellow Primarch. The Emperor would have felt all of this, would already have seen in his mind what has happened; he can try to frame this as two of his sons, famously headstrong and stubborn, as fighting as only brothers can- one is fighting for his father, one fighting because he thinks his father is wrong. Horus is only mistaken, though, isn't he? Surely his father can find out what's wrong and ease his mind, say the right words and make it all right.
But, Horus is killing his father. The Emperor can't bring himself to do what needs to be done. He knows his son is sick, but Horus is the brightest and best, the future; the Emperor just has to hold on, the solution is there. And then, through the door through which the Emperor himself walked only minutes ago, a lone Astartes runs in (I'm sure it's an IF who comes in, rather than a Custodes; if it was a Custodes, the Emperor would know his name) and charges in to try to save his Emperor. What threat is he to Horus? None. Against a Primarch an Astartes could do naught; against one infused with the power of the chaos gods, such fury would be a breath in a supernova. Horus doesn't need to pay any attention, the IF is already dead, he just doesn't know it. Horus doesn't even look away from his dying father. He probably doesn't even register the non-threat visually at all. He could just bat the man away, but he doesn't. Instead he turns his power on him, flensing the flesh away layer by layer, pain and cruelty all as one. There is no point to this. There is no gain. And if Horus will do this to one who is no threat to him at all, what will he do to those who are not Astartes, even less of a threat? And so, even though he knows Horus killed his brother Sanguinius and is responsible for the deaths of billions of others, it is the death of this one man that finally breaks the spell that clouds the Emperor's mind. And he does what he always hoped he could avoid.

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