In no particular order, and via either free agency or draft:
LT: Solder being healthy has been a HUGE difference between this season and last season. I'd rather not
count on that happening 2 years in a row.
Big RB: As was the case with Solder, so is the case with Blunt.
Move TE: Especially if Bennett isn't re-signed.
WR: Even if Floyd is re-signed, he is certain to miss multiple games in 2017.
DE: Maybe even if Sheard is re-signed, which I very much hope happens. Ninko & Long are at the end
of the line, and are merely backup-caliber now. And GeeNo Grossem is nobody's answer to anybody's question.
DT: Branch is a UFA; and adding a 3-Tech would be nice too, such as Nick Fairley, for whom I've been pimping for the last 2 years.
Coverage LB: A full off-season for Van Noy and Mingo (2017 option?) will obviously help, but more
athleticism at the position is still needed.
CB: Even if Ryan is re-signed, an upgrade to Cy Jones, Jonny Jones & Justin Coleman are needed.