So far the theory I am running with is that maybe, hypothetically, the sheriff's wife & daughter left him recently due to issues at home... this judge handled DV cases... And the judge was trying to help them get away. Seems like the sheriff called his daughter from his phone and she didn't answer, so he called from judges phone and she answered, which set him off and caused him to murder his friend AND make the "trying to kidnap my wife & kid" comments he made to deputies at the jail (per the lead detective on the stand in the prelim. hearing).
Defense SEEMS to be painting a portrait of the judge potentially being inappropriate with sheriff's daughter, and was trying to get across that evidence of that could potentially be within apps on the judge's phone AND the daughter's phone instead of the usual phone records.
Either could be true, neither could be true, or both could be true.