(RSBM)
IMO, this is the big stretch. Why would he need to do that at all? Stranger abductions of children happen (although not as often as one would think here) without partners all the time. He didn't have to approach any school, especially that school. Look around. I've been doing it for three years. There are unaccompanied kids walking, playing, and riding their bikes everywhere you go.
If he indeed had this fantasy, all he had to do was cruise a park, a playground, or any street, even in a rural area. Why kidnap a random child from a school in your own home town and transport her out into the country to assault and murder? What was the rush? He could have driven around the Guelph or Mount Forest area any time and found a vulnerable child. Instead, he got some teenage junkie he barely knew to kidnap a kid in broad daylight from inside a school with witnesses all about? It's risky as hell and makes no sense.
I posted this before. 90% of non-family abductions are by men alone. He did not need TLM or anyone else. He was wily and physically strong. He was familiar with the Mount Forest area. He very well could have done this by himself - IF it had been his idea.
JMO