I would not be surprised to see Corey Davis on a lot of waivers this week.
Think you are missing the train on Mack. The loss of Luck has been drastically overstated. You can squarely put yesterday's loss on Vinatieri. One missed XP and two missed chip shot FGs. Brisset looked good against a slightly injured Chargers defense. Mack/Brisset are playing behind what is probably a top 5 OL, if not higher. Even if you take away Mack's long run, he still had +110 yds rushing. I think a lot of people still value him as a mid RB2 though. I think he will surpass the fantasy value of Fournett, Michel, K. Johnson, Henry quickly. Is he going to have weekly outings of 30+ points No, but he is the type of RB who's weekly floor will probably always be +75 yds rushing and 60% TD He would be a target for me, but I live in Indy, so the homer value doesn't bode well.
Jury's still out on this and prob will be that way until Baltimore faces a decent defense. Miami is going to be a team to stream against all year. Whole team is a mess.