Excellent Q's! Why the need for gloves if Rebecca used her bare hands and left prints/DNA on various items such as bedpost, one knife, rope, paintbrush, etc.? The only thing that makes sense is that some drunken, raging, vengeful murderer went overboard in "staging items" in this "overkill" of a crime scene.
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I did see a photo of police officers in the courtyard wearing black-nitrile gloves. Are the officers supposed to remove their gloves and give them to the evidence collection team when they are through? If so, it appears someone may have simply misplaced a glove? Just my thought.