An alternative suspect case is known to be one of the most powerful ways to get a jury to vote for acquittal providing the defense attorney can make sense of what happened including all of the evidence.
There have been studies of the effect of such a defense.
"Participants in all TODDI versions, in which there was an alternative suspect, still believed that the defendant seemed guiltier than any one of the alternative suspects. That is, the TODDI story was never better than the prosecution’s story. Yet, adding one TODDI story decreased the number of participants who rendered guilty verdicts from 73% to 35%, and ratings of the likelihood that the defendant committed the crime decreased as well. Adding the second and third TODDI stories was not statistically significantly better than employing a single TODDI story (although all measures of guilt did decline slightly)."
"The results of the current experiment suggest that in court, the addition of one or more alternative suspects would decrease jurors’ belief in the defendant’s guilt, even when the alternative suspect is not actually believed to be the culprit. (See Tenney, Cleary, & Spellman (2009) for more study details.)"
How does a criminal defense attorney argue for a Not Guilty verdict? One strategy is simply to argue that the state’s case is incomplete and has not been proven beyond a reasonable doubt; no more is required. Another strategy is to provide alternative explanations of each piece of evidence...
thejuryexpert.com
This is a case where there seems to be a big giant black hole between the time BK's phone was in Pullman to where it was near Genesee after the murders. There does not seem to be a victim identification of BK or any eye witness, video or anything else to place him in Moscow. So, IMO, this is a case where an alternate suspect case could work very well.
I also think that the defense will hit on your 1 - 4 issues as well and the fact that the political pressure was on to make a fast arrest due to UofI Moscow turning into a ghost town in the wake of the murders.
All JMO.