“Baird and one or two lab workers are the only ones who have the results of the DNA so highly unlikely that there would be a leak IMO”
You have to remember Baird was hired by Birkhead to collect and analyze Anna Smiths DNA. More than likely, Birkhead knows the results, but understands the need for secrecy.
It would not to be an explicit hint from Braird. Maybe something like Baird encouraging Birkhead to “show up in Court”.