Originally Posted by Garviel loken.
But lolens survival means something. The mournival represents horus as a whole, each member a quarter of him. By killing of LOKEN and Tarik, horus thought to kill off the weaker parts of himself. Lokens survival in my opinion, gives horus self doubt now. And lolen may be the reason why Horus turns good just before his death
See, this is why the way he was 'killed' and the poor confrontation in Vengeful Spirit were both bad.
To use the metaphor; Horus killed his jovial and thoughtful dispositions with his anger and dourness. Fairly on the head. But removing Horus' agency one step wasn't the neatest device. If he'd just killed Loken himself it would have been far more satisfying narratively and thematically than using the (badly) set-up Mournival. The Mournival tearing its brotherhood apart works fine, but that could have been done alongside Horus himself stepping forward to kill Loken and Torgaddon. It was a squandered opportunity, presumably done because the intention was always to leave it open for Loken to return, and having a Primarch fail to off him would have been pushing acceptable narrative coherence.
So once he came back, this character who represents Horus' considered thoughtfulness, he really has to confront him. But that should have been saved for later on in the series, when it would have had some sort of thematic impact and introduced a change in Horus' behaviour - being confronted with a form of, if not conscience, then at least a straightforward 'hey this is what you've done and become, it's really far from what is a sensible person' should have some effect on Horus. It would also be another opportunity (although not as neat) to have Horus kill off that aspect.
You see, we are supposed to believe that Horus, by the time of the final battle, goes full proper evil no more mr nice gaius. Apart from the little chink of goodness that is reawakened at his very end. So Horus is going to get worse, not better, despite Loken slapping him in the grey matter metaphorically. So it's a busted trope, it didn't work and was a waste of time, constructively speaking. And also just narratively as all that plot strand did was throw away the Little Horus/Loken thing and kill Qruze. Okay, I guess it made Loken a bit saner and together, but we weren't in a rush, he could have stayed in his moon garden for a while yet. Cards got played too early.
Sure, maaaybe some awful contrivance like the something that reminds Horus of Loken will end up in the final battle, but that would be god-awful schlock writing.
Loken being dead would have been the best result.
But him being alive wasn't automatically bad and it could have been good.
But what they've done with him has been bad.
The thematic pacing is close to being completely shot to buggery in the series IMHO.