The only recent operator to YYZ has been Zoom. TCX have never operated the route, or sold seats on Zoom flights.
I personally think if anyone was to operate CWL-YYZ, TCX would be the best for it.
Maybe they will make use of the 757 that is rumoured to be operating SSH this winter. Even though time is pushing on for winter flights.
The TCX schedule for next year appears pretty much sorted. They will be selling FAO and PMI using Baby flights.