Winston is the only character whose point of view we have access to in the novel, a necessary precursor for the potential of an unreliable narrator. After all, without an external perspective, we can never be sure what he's not telling us, nor whether the context in which he presents the information is accurate.
Take, for example, the way he blames himself ...
The crucial events that form end game of The Scar are these:
The real Hedrigall and the Arrogance go missing.
A considerable time later, a Hedrigall is found drifting on the wreck of the Arrogance in Armada’s way.
He appears to be confused and surprised that not everybody is dead.
Unless mentioned otherwise, Hedrigall refers to this Hedrigall in ...