I don't disagree, but Feldman got Faulkner to say that he only saw one generation of flies, which could support a conclusion that the body was disposed of around 2/16-18.
The real key is that there were no beetle larva in/on the body. This is what establishes the no earlier than date after a time that DW could have disposed of the body.
There is nothing to indicate any reason there is no evidence of earlier insect activity.
That is what the jury is left with for ten days.
Read 'em and weep VDAs.