hI.
It usually depends on how far the application is into being processed. If your friend has just send his application, he can submit his wife's documents too and claim those 4 points. In other words, if his application has not been processed yet, he can send her documents and claim those 4 points.
Mark
CIO, NS does not calculate points or have concern about points. What they do is "verfiy NOC and Duties" and "completion of forms".
There is no harm and OP can make amendment at the time of submitting full docs to local visa office, while explaining the situation.
MH