I expect change on the offensive line, at the least just Faalele, possibly both guards and at least 1 tackle.
A fresh set of eyes, a different view of the players and yes, better coaching. Remember, a side from 1 player on the line, Vorhees, that line in each of the past 2 years, was one of the best.
As for rankings, especially by PFF, meh, they are for selling hits and clicks, fantasy & such.
If Kirk Cousins, a statue, could have that team 1 game from the playoffs after their horrible start, yeah, I give this guy a lot of room