The theory is he wanted both their deaths to appear to be double murder, not double suicide.
From the description of how Honey was found, face bloodied, cuts on nose and lips, and sitting on a pool of her own blood, after having laid face down on that pool of blood for quite some time, it's impossible to believe double suicide.
Keep in mind they were found wearing their outdoor winter coats. We are talking Canadian winter coats, which are bulky, and most have an attached hood, and many of the women's coats have fur around the neck area.
I can't figure out how the alleged perp(s) would have tied their wrists under the winter coats sleeves.
Strangled them with some type of ligature other than belts.
Then remove those ligatures once they were dead.
Then remove BS belt from his pants, and get another belt (source unknown), and put those belts around their necks.
Then tie them in a semi-seated position from the pool railing.
Then remove the hand ties, and pull the coats down their arms.
This sounds just crazy, and so complicated. If this is the case, then there should be mounds of forensic evidence all over the place. JMHO