I totally understand what you are saying, and its what scares me the most..
I have seen the Jury instructions that HHJP gave, specific to this case, but I do not know what the standard instructions or Nor do any of us know what instructions the lawyers are writing in as well.
So,if you can share what you know exactly the law says, that would be helpful. But this a a circumstantial case, and it does not have to be proved with out a shadow of a doubt, but a reasonable doubt. There is NOTHING reasonable about what the defense showed , (yes, I know they do not have to prove burden) but...the defense blew any other possible reasonable doubt out the door...it can either be death by drowning, or whatever the States says.....IMTOSO ......lol