Wild speculation about what the Pistorius siblings may or may not have thought/said/done achieves little, IMO.
It is far from 'safe' to assume,for example, that Aimee collected the handbag for sinister purposes and in so doing, dragged Carice Stander into it with her.
Neither is it safe to draw any conclusions about their character or that of their brother - (who often seems to be cast in the role of master-sibling-manipulator whenever the topic of the bag /phone crops up)- from little more than unobjective guesswork.
Also, the psychologists who assessed him seemed convinced that his 'grief' is in fact, grief, and therefore doesn't merit the inverted commas.
Sorry, the inverted commas stay given that it is accepted psychology is not an exact science then by definition those who practise it cannot give an exact answer which leads to the conclusion there has to be some degree of probability that his ‘grief’ was not genuine.