Personal opinion -- all these bloodlike and biological stains are matched to odds in the billions to JFd (or her toothbrush, at any rate) and, where it appears there might be a second contributor, FD and MT (and the strong of others) are eliminated.
I think the State is just getting out ahead of this so there's no thunder for the Defense.
No one expects MT's blood to be there. Not FD's. No reason to believe he was bleeding, every reason to believe he was wearing gloves, thereby reducing DNA transfer.
Because we all know how much JS would like to sing and dance that FD's DNA wasn't all over that garage floor. IMO he took measures to ensure it wouldn't be!
It's good to remind myself we have 4+ more weeks IIRC.
Lots of testimony and dot connecting ahead!
JMO