If there were mixed motives, and two or three people involved, the handwriting & DNA evidence might not tell the whole story. I tend to think at least two, and probably three people were involved for these reasons and others. Perhaps each had his/her own part to play in the kidnapping/murder plan.

There is a marked change in pen pressure toward the end of the ransom note, leading me to believe that some kind of chemical changes were taking place in the brain, or more than one person penned various portions of the note.

BTW, I recently re-read an old newspaper article about Lou Smit and some of the intruder clues in the case. Lou saw photos of a protest march, and one horizontal banner proclaimed "SBTC." Below each letter were the words..."Stop Bombing Third World Countries" which fits nicely with the false theme of the note by a "group of individuals who represent a small foreign faction."