I believe that Tori was drugged, as well. The question is when and in what order the events happened. She could have been drugged before the sexual assault. (I hope so!) If she was, it was not out of compassion, or even cowardice, but for practical purposes. That feisty child had to be kept quiet all the way from Woodstock, through Guelph, and several stops before the Mt. Forest destination. Maybe she was drugged immediately, but it wore off and they went to get more from BA. Maybe her protests got worse by Guelph and that's when they felt the need to silence her.
If BA interacted with both MTR and TLM, that would mean that Tori would have been left alone in the car. They'd never do that, IMO, had she been conscious. If BA was MTR's friend and not TLM's, it would make sense that she'd stay behind while he picked up the drugs. Otherwise, Tori could have escaped or screamed. The other possibility is that BA is lying and Tori went into the house with them. BA could then be charged as an accessory and for withholding evidence.
There are many more possibilities here. We'll have to wait for the defence's statements and evidence to hear another side to this story.
All above JMO