So I'm going to categorically rule out Ultra/Ratchet being teamed here, as it is not in either player's scum meta to play in each other's lane and tie themselves to the hip like this. Especially over something like trying to get a Luka mislynch d1, at the expense of battling it out with a Gram/Poyser tandem. I think the inverse is true with Gram/Poyser going hard to defend a Luka town read against players who know him better.
Given this, I think that what Ratchet/Ultra are saying about Luka obviously has to have some merit. They both have more experience playing with him than either Gram or Poyser, who I do think have biases against Luka's playstyle. Also, as someone who was teamed with Luka last game, I actually thought he played quite well and managed to keep a consistent narrative throughout the game despite being hyper active, which is impressive for anyone to do as scum. I felt like Gram was discounting that quite a bit in the dead QT so not surprised to see him continue to discount Luka's ability here. I think it's genuine coming from him at least. Not really sold on any of Ultra/Ratchet/Poyser individually but can at least rule out Ultra/Ratchet being teamed and I think Gram is town.
I also have to say that I wouldn't be surprised if Ratchet and Luka are teamed again. Ratchet jumped on Luka as soon as it was pointed out that he flipped his poyser read on a dime. Last game Ratchet mostly pushed his teammates and I could see him wanting to mostly town-side again here, especially if he's drawn scum for the third time in a row. Ultra came to it much more organically. But actually most of Ratchet's focus has been shading poyser's reason for town reading Luka which comes off as trying to make him look bad on a Luka scum flip to set up a poyser mislynch d2. Maybe he's on to something and poyser is protecting his teammate but I don't think poyser's progression fits that theory super comfortably
In other words I think Ultra/Ratchet are right but I think Ratchet is a little too sure that he's right and is trying to set up poyser for a fall here