I just finished the update...
SPOILERS BELOW:
The scene with Dave hallucinating, thinking he was seeing his dad, when it was actually Tyson made me so happy, but I knew in the same exact moment what it meant was going to happen, and that reduced me to tears. It's officially the first time since I started reading the VN that I've done more than just tearing up a little.
This leads into the second thing I wanted to say. I'd known it for the last SEVERAL updates, and had been waiting patiently for confirmation of it... I knew Roswell was Thanatos' master. There were several things about Roswell that, throughout the story so far, felt strange to me and led to my belief of it.
The fact that Roswell had a condition where he knew he was going to die was one. My guess? He created Thanatos to use what time he still had to help secure answers for Dave's questions about what happened to his dad. After all, if he could keep going back in time, by means of both the vault and Thanatos, maybe he could bring Dave some kind of closure he never got? What better way to use the time you have left than to help a friend with the deepest wound in his heart? Bringing him to the mansion, where he had Thanatos waiting, made sense.
Similarly, but aside from the above point, there was the slowly growing connection between Roswell and Oswin. It went from "Oh, we don't know eachother", with it even being said when you initially question Oswin, to the photo with that message "I love you" that Oswin wanted Dave to give him. I don't know this to be factual (and heck, it probably isn't) but my personal thought is that Oswin was left in charge of Thanatos while Roswell wasn't there, with knowledge that he was coming back because he'd been through it before. And the picture he gives Dave that he asks Roswell to pass along, with the "I love you" message, was meant as a way to say he still cares even despite the fact he's being repeatedly put through this many times. The picture itself told me Roswell was more a part of things than Dave had been led to believe up to that point too.
The biggest clue for me though was Roswell knowing (in what was the path B timeline if I remember right) that Thanatos had baited Dave with the intention to knock him out after he'd handed over the medal. Yes, Thanatos could have just TOLD him that, but given how unhelpful Thanatos had been through the whole story, it seems more likely that Thanatos, at that point in time, was intent on just trying to get to the bottom of things his way, against Roswell's wishes, and Roswell was trying to put a stop to it, but fell short of being able to.
I openly admit a lot of what I've just said sounded a lot better in my head than it did trying to type it out and explain it, but it's around 3:30 in the morning as I'm typing this.
The TL:DR version of it is, for the past three or four updates now, I had figured out Roswell was Thanatos' master, simply because several things about the story left me focused on him during the last few updates, and, the more I did, the more sense it made. Despite knowing now that Roswell is Thanatos' master though, it doesn't make me hate that rat any less. I say this somewhat jokingly, but a part of me is annoyed with Roswell for creating Thanatos with as much of an attitude as he has.
The only other thing that worries me about knowing Roswell is Thanatos' master is the fact that I think I also know why the deaths keep happening too... I don't have a solid answer for that just yet though. Interestingly enough, Dave dying leads to what will tell me whether or not my thought process is correct or not. Especially now that I know Thanatos belongs to Roswell.