I think you are being overly pessimistic.
Here is an area where I think you are over estimating the opponent and underestimating the Pats.
JSN is stellar but he is also by far the singular most productive part of their offense. This is stark contrast to the Pats offense that spreads the ball around much more effectively. It’s a question how Seattle would do if Gonzo can take JSN down to normal NFL WR performance and the game depends on how the rest of their offense stacks up against ours. I think we stack up pretty well. Diggs and Boutte are our closest comparison to JSN imo, and there are two of them to cover not just the one prima donna. Hollins is our wily veteran, Rham is a very effective receiver out of the backfield, and we have Pop, Henry, Hoop, Hendo, and Williams all eager to contribute. Apart from JSN I really don’t think Seattle has the advantage you assert they do.
I agree with your QB assessment but I think you too quickly blow past it. Darnold has compiled enough of a body of work to have shown that his “seeing ghosts” game was not an outlier. His performance depends on his supporting cast, not just the ball handlers but also his OL protection. We have multiple playoff opponents giving props to the Pats D for showing one thing and playing something completely different. Most recently Sean Payton, talking about a failed fourth and one play, commented "The look they showed on film, and the look we saw, wasn't the look we got." The Seattle O line is weakest up the middle, where the Pats DL is strongest. There’s a very good chance chance that Darnold will be seeing the same defense that has confused Herbert, Stroud, and Sean Payton, with pass rush pressure up the middle and solid coverage behind it, and will end up once again seeing ghosts.
Drake’s biggest problem has been getting time to throw. He has also been trapped in the pocket a lot in the playoffs. Josh has not given him much help with either play calling or blocking help for the OL. If Drake gets a better pocket, or starts rolling out and/or scrambling he could negate some of those protection problems, and some better play calls by McDaniels could help a lot. I’d say Drake’s play is third on my list of concerns, behind the OL blocking and Josh’s play calling. I’m also not worried about receivers making tough catches, they’ve shown they can do that well if Drake has time and delivers the ball on target.
We absolutely should walk in planning to do everything we know that will help to produce”bad Sam Darnit” in this game. Vrabel wasn’t here to be one of the ghosts Sam was seeing when he played the Patriots in the past, but Vrabes and Kuhr have shown the ability to produce similar defenses this year. Plus, Darnold’s record against the Patriots is pretty consistent: 0-4, 1 TD, 9 INTs.