I believe you've misunderstood. The issue isn't which of 12 possible arguments the prosecution was planning to use; the prosecution isn't required to divulge its strategy.
The issue is that the defense didn't get the actual lab results--the numbers which are used to draw a conclusion--in time for all of its experts to weigh in on the veracity of the prosecution's conclusion. For this reason, some of the defense's DNA experts couldn't and didn't sign the report.
This appears to matter because most of the DNA experts involved (admittedly, most are those hired by AK) think the numbers found on the knife are too low to match to anyone.
I guess I'm having a problem understanding the problem. The lab completed DNA analysis. We know that. I'm assuming that all parties could request the information from the labs, and that seems to be true. The DNA analysis started on Dec 21, 2007, ended on May 20, 2008, the report was dated June 12, 2008 and delivered to the prosecution. Those dates tell use that complaints from defence that they did not receive the information in April are baseless. The trial started Dec 4, 2008 and the DNA evidence (Stefoni) was introduced May 22, 2009.
It seems that the important question is:
Was the information made available to the defence prior to trial?
If the DNA analysis was made available to the defence prior to the start of the trial, how did that present a problem for the defence?