My opinion
Nel letting on that he is going to ask for the minimum sentence is a good bit of news here. I suspect Nel is hoping that the public and the judge will say "Now look how reasonable this Nel chap is after accusing Oscar of hunting down his terrified girlfriend he is now content to call it a simple murder, a mistaken use of deadly force rather than a barbaric slaughter" and settle for 15 years. This doesn't fly with me and shouldn't fly with any person looking at the evidence of the case and the vitriol that has been espoused by Nel over the last 2 years.
Nel has a bit of a problem as the court has painted itself into a corner. The court was negligent in its first ruling (per first appeal) the court will throw anyone under the bus not to look bad, I don't care what country the court is in. The court already threw the first judge under the bus, if Nel thinks the court is going to make itself look worse by waging a battle against one of the countries golden families Nel is going to be in for a rude awakening. Oscar is a sympathetic figure whether Nel wants to face that fact or not.
I suspect Oscar is going to get time served citing extenuating circumstances and the courts own error,Oscar will remain free contingent on good behavior for the next 13 years, probation, restrictions on his free movement and community service.
Why would Nel who has shown nothing but a sadistic streak toward Oscar suddenly say "Lets just be dandy about this and give Oscar the minimum sentence."
Something curious is afoot and Nel is well aware of it.