Steelers are doing nothing this year, they had hopes of Kenny Pickett starting for them when they drafted him but it now looks like Mason Rudolph will start which is just horrible for them. Steelers are going 7-10, they won't even be a factor in the playoffs.
Not sure why everyone rates the 49rs so highly, they haven't done much recently, they were only 10-7 last year and only just scraped into the playoffs. I can see Tua picking them apart without too many problems. The Dolphins beat the 49rs easily in 2020 and that was when San Francisco was good. The score was 43-17. Tua is better and more mobile than Fitzpatrick and they now have a deep threat to stretch the field. I think this game will be something like 28-17 Dolphins.
Ravens are tricky, the bookies give Miami a plus 4 start so they are the underdogs away from home. All depends on whether the Dolphins can keep the Ravens defense away from Tua and they can stop Lamar Jackson which will be tough as the game is at the beginning of the season, so he will be pretty fresh. I give this game to the Ravens but it will be close I think.