I agree. The fact that their Lawyer, who dealt with estate matters was trying to reach them by phone the evening they were murdered, after the meeting with the architects at Apotex, probably explains why Barry told one of the Architects he had to be home early, and Honey was home from shopping before Barry arrived. It looks like they both wanted to have a conversation with their lawyer about estate matters, and probably new wills for each of them. Honey said earlier that same week when she uncharacteristically canceled attending an important charity meeting, that she was"dealing with some stuff", and she told a friend that she had updated her will. Perhaps she had hand written what she wanted the lawyer to include, and would have used that in their discussion that night. The killers likely took that away if it was in plain sight, as well as any notes or copies of wills that Barry had with him. It does seem that they were murdered at "the eleventh hour" before they could make financial changes that would have had great affect on their heirs/and or close business associates.
I think the staging of the bodies was not an attempt to copy the positions of the life size statues in the next room, but an attempt to make it look like murder suicide. If Barry was posed to look like he was calmly resting, and at peace, with his legs crossed, and his glasses perched perfectly on his nose, while Honey had injuries to her face, and some blood pooled near her body, it might give the impression that Barry carried out the murder, then suicide. The problem with that is that anyone who hangs themselves would have some involuntary head, neck, and leg movements, likely moving the glasses, and the legs would unlikely be crossed. Also the killers failed to understand that the zip tie marks on the wrists would show up in an autopsy. If Honey and Barry had jackets pulled down, as a type of restraint, that could also look suspicious to TPS, although the killers may have thought that it would look like Barry did that to restrain Honey, and then managed to to do that to himself to make it easier for him to go through with it. It seems to me that for a man who had access to so many lethal drugs, and who understood them, if he were going to carry out a murder suicide, he would have used drugs. If he had killed Honey in anger, he could still have used drugs on himself. The fact that Honey's phone was left in the upstairs bathroom, and Barry's papers were left in the basement hall, where they probably fell after a struggle, also indicates killers, who were not professionals, as KD has already speculated.
More and more, it looks it seems, IMO that it is a case of" follow the money", and who was desperate to stop Barry, as well as Honey from changing their wills? Who benefited, and who had motive?