From my understanding, the TTC formed an internal committee about 7 or 8 years ago - shortly after the agreement whereby they would be operating the line - in order to liaise with Metrolinx and Crosslinx more closely on the project. TTC staff have absolutely been involved since day 1 since the line is interfacing with two existing TTC facilities, but this was more so to handle and deal with both figuring out the operations and also to ensure that the work meets the TTC's design requirements - and what changes may need to be made after the fact to meet those requirements.
TTC has already trained their training staff on the line, and will shortly begin training the operators.
They have in the past. For Sheppard, they called upon 2 employment firms to provide several hundred "passengers" for various aspects of the commissioning process.
But my understanding is that generally it is usually employees and their families who are enlisted when actual humans are required.
TTC has been involved for some time, as I explained above.
What might be happening now however is that Metrolinx is finally listening to them.
I don't think what you've heard is completely true, to be fair. But there is certainly a fair amount of animosity on both sides.
Dan