Oscar most certainly still has the right to silence in terms of ANYTHING that could incriminate him re: the crime. Solving a crime or extracting a confession is not what the panel will be doing.
One must remember that this a court ordered evaluation, in which the court has instructed a panel (3 psychiatrists - most definitely - 1 defense, 1 prosecution, 1 STATE institution Weskoppies for example along with any clinical psychologists, forensic social workers etc that might be agreed on - Barry has already alluded to clinical psychologists). Oscar whilst not having to answer any incriminating questions (and any admissions of guilt will not be admissible in any event) has been ordered by the court to participate in this evaluation, testing etc.
The gold mine I speak of, is that all reports compiled by the panel will be available to Gerrie Nel. These reports will clearly indicate where the information was gained and will in all probability refer to his childhood, events, events leading up to the incident, interviews with WHOMEVER the panel desire. This in order to provide an appropriate diagnosis if necessary or highlight his mental capacity at the time of the shooting, as well as now.
They have to state to the court if Oscar knew the difference between right and wrong, and if he was able to act accordingly etc etc.
To do this, the panel (and the PT's psychiatrist in particular) they need a VERY BROAD frame of reference. Not just fond words and recommendations from loved ones.
In their findings and reports lies a potential gold mine. Gerrie would never have come close to having a PT shrink actually interviewing Oscar - not even if he re-opened his case. It would not happen. The only way a PT shrink was going to come close to Oscar and his inner working - would be through sectioning.
Remember, that state are NOT entitled to call character witnesses during the presentation of their case, so much of what the prosecution knew to be 'true' about OP's character - was buried. (The Myer's girls have stated that nothing they told police in statements has been revealed in court - this because it is inadmissible.)
However, this evaluation brings the opportunity for 'some' of OP's previous behavior etc to be evaluated - and not just from a positive PR family, defense paid angle.
Gerrie get's access to everything that goes down in the 30 days. For the PT (who have been fighting blind, due to the accused's and defense's 'blanket right to silence' on eveyrthing) this is gold - of huge value.
It tells him exactly in which way to move forward (closing etc) What is found in these reports (the findings) - WILL be entered into evidence, and may be used in argument.
Remember, OP can refuse to answer anything put to him by the panel. Anything that may incriminate him. He has however been ordered by the courts to participate. It's risky for him to be anything other than co-operative............
(personally, I believe Gerrie reckons his true colours won't take long to emerge without the help of anything external. OP can not keep up a facade for 30 days. The hope for the prosecution, I'm sure: Fit to stand trial, zero anxiety disorder, but Narcissistic tendencies etc)
It really is beneficial to the PT - either way.