There is nothing complicated about "the body could not have been deposited before Feb 13"; more than a week after DW was being followed constantly.
Too bad you are not dealing with some exact science. Battle of the paid off "experts" that's all. They all cancel each other out. And if Danielles body was covered for a period of time the "results" could be "skewed" remember that?
The defense can't counter the Blood, DNA, fingerprints etc, in any credible way. That's why Westerfield will be convicted. Nothing complicated about it.