Ashley J/prosecution didn't respond to that substantively, though maybe I missed it? I believe because they deemed it unnecessary, moo. I think we'll find out in due course that the blood was so degraded and aged that as we already know, the DNA extracted from it didn't qualify for CODIS upload. That is my guess/speculation.
Also noting, the inside, unknown male profile was on the hand rail ( of the stairs I'm guessing jmo) so not what you would call in proximity to the victims. If railing does refer to stair railing makes perfect sense that forensics swabbed there. Jmo