When you don't like what the first guy you hired had to say (David Faulkner) buy another one to say exactly what you want him to.
I know you consider forensic entomology to be an exact science on a par with mathematics. But don't be surprised if the prosecution calls one of Faulkner's colleagues as a rebuttal witness after the defense rests. They can do that, you know. There are good reasons why Faulkner qualified his estimate of PMI, admitting under cross that time of death could have preceded the date he favors.
Perhaps prosecution will call someone like Didier Gosset, who will soon be presenting his published research at the 16th AIFS Conference ("Effect of chemical substances on the delay of colonization by necrophagous insects and implications in the determination of the post-mortem interval") or J-B Myskowiak who will be doing likewise with his own research (" Effects of refrigeration on the biometry and development of Protophormia Terraenovae and its consequences in estimating post-mortem interval in forensic investigations"). Others could include Goff, Bourel, Benecke or any of the other 70 or so forensic entomologists who are known to frequently differ in their opinions concerning methods of PMI determination.
Of course, it's certainly possible that Dusek will allow Feldman to create the impression with the jury that Faulkner's profesional opinion is the only one out there in a sub-discipline that has only had it's own organization for 6 years and that has not yet settled on its criteria for certification. Did you know that the national body representing entomologists refused to act as the certifying organization for forensic entomology?