One of the many differences between real-life criminal trials and fictional courtroom dramas, is the subtle but important one that, in real life, the prosecution's job isn't to tie up every loose end. It's to persuade the jury so that they are sure (as they say nowadays in English courts) that the defendant is guilty.
So long as the jurors conclude on the basis of the evidence they've heard that it's beyond reasonable doubt that the defendant did it, they don't have decide on every other detail in the case or resolve all the unanswered questions.
Yeah, I sat as an alternate juror on a murder trial and its nowhere near as neat and tidy as depicted on TV.
As an alternate though I got dismissed before the deliberations. He was found guilty though. I kind of went back and forth a bit.
They did not have the weapon, which made it tricky, but there were witness accounts from others in the vehicle (it was a drive by). The witnesses also.had some vague inconsistencies on what they did that night.
The video and cell tracking evidence was goody too. Like here is a video, there is a person that was on the video, but its small and grainy. The cell tracking was basucally accurate withing a block, but not like, an exact dot.
The potential other killer was not present to testify because he was on trial elsewhere, for murder. The defense made some iffy arguments about lack of DNA evidence, after the lab tech and detective basically said "We don't do that because we don't have the resources."
Prosecution came off as young and a bit inexperienced, the defense came off as a bit incompetent and we (the jurors) all agreed he looked like Jerry Springer.
Granted, this was a small city thing, not a highprofile national event.