Pie/Mikal - Very unlikely. I believe either of them could be OG scum, but them as a team just doesn't make sense to me. Their back-and-forth looks genuine and, in particular, Mikal's efforts to soft his Motivator claim to Pie just reads as enough uncertainty that I don't buy it being manufactured. Pie would have every reason to use that to "confirm" Mikal's claim if they were a team.
Mikal/David - Very unlikely. It's possible that Mikal would just hard bus his own partner here, but the degree to which he believes David must be on the scum team based on so little just doesn't come off as trying to put distance between them, especially since it doesn't give Mikal an out if David did flip scum. I'd say it's slightly more believable than Pie/Mikal, if only because their exchanges have been less extensive and could be more easily faked.
Wryly/David - Very unlikely. It's a meeting of two low probability recruited scum. Wryly stands a slightly better chance of being OG scum just because she could be a scum Tracker, but I don't see Wryly giving Mikal cover after that, so that chance has gone down significantly.
Mikal/Wryly - Possible. That Tracker result on Mikal places these two together or not at all. Wryly remains a very unlikely pick for a scum recruit, but I can't dismiss her at this point. Scum could have picked a relatively new player specifically because they'd be written off as an unlikely pick. That paired with Mikal, whose claim sticks out to me the most as odd and who is almost entirely reliant on being Tracked to Wryly as an alibi for not having committed the NK, means I'm considering this pair.
Pie/David - Possible. I still believe David's very unlikely to be scum, especially given his stated willingness to be lynched next DP, but I also can't just write him off for something he's promising to do later. It's hard to ignore that his role is particularly beneficial for scum to recruit, that it can't be confirmed without lynching him, and that his CC of Thoth in DP1 made him look about as townie as possible from the outset. And Pie could very probably be OG scum. He keeps arguing that there are plenty of reasons why he isn't scum, but it all seems pretty loose when it comes to nailing down his role early and pretty weak when it comes to tests. Pie hasn't been Tracked, either. He has and can have no role validation, so he's relying mostly on behavioral choices like pushing the massclaim to carry him through.
If I had to pick, based on both the likelihood of the Yakuza being used on David vs. Wryly (Mikal couldn't have known that Wryly was the Tracker, so he and Casey would have been selecting blind) and the lower likelihood that Mikal and Wryly would tie themselves together that closely through a Tracker result, I go with Pie/David as the most likely of the two.