It seemed to be the general consensus that they begin with Allard-- they had the biggest bargaining chip when it came to him, and the most to go off of. And considering his (unintentionally?) dropped hint at the very beginning of the mission, he was also the most likely to talk. They could approach him to get him to tell his side of things, and his testimony would likely provide a solid backing for their interrogations of the others.

"Allard," Tim said, flatly, as he approached the man with the others. He was careful to not let his voice betray accusation, but also to not sound totally at ease either. Even if Allard was likely a victim here, he didn't want to play his hand too early. "We wanted to speak to you about something we found. We were wondering if you could shed some light on the matter."