People like Papadopolous came abord the Trump campaign soon after Trump got railed by the media for not having foreign policy “experts” on his team. Trump was running a campaign with very few people but added some volunteers for foreign policy. They may have all been CIA/FBI plants.
Perhaps, they were plants, I don't know. But you're right, the Trump campaign was being criticized for not having a foreign policy team at that time. That's when the campaign announced the team, including the unknown Papa Dee. None of us here had ever heard of him. Something seemed not right.