There are lots of pieces to the puzzle this year, that could all come together, fall completely apart or come together partly:
Will Dak improve on last year?
Will Hurns and Thompson mesh quickly?
Can some receiver step up and replace Dez?
Will Vander Esch shine as a rookie?
Can Lawrence continue like he did last year?
Will some DT provide some interior pass rush?
Who will fill LG?
Can Williams make the transition to guard/push Collins back to guard?
Can the dbs mesh?
How will B. Jones handle cb? (Assuming he is going back there)
Will Irving get suspended from the DV accusation?
Can Linehan get Beasley back to single coverage?
Will T. Smith's back hold up?
Can Swaim or Gathers or Jarwin fill Witten's shoes?
Will T. Will's foot heal up back to normal, and in time for him to participate in camp/play pre-season?
Can Bailey get back to his old super reliable self?
Will Chris Jones be upset at not making the Pro Bowl and fall off in performance?
Of course every team has some issues and question marks, but there's literally no part of this team that doesn't have issues or question marks. The Patriots still have Brady, the Steelers still have a two-time SB winning quarterback and one of the game's best at receiver and running back, the Seahawks still have Wilson who carried the team last year, the Giants picked up a top rated running back, have a two time SB winning quarterback and may have fixed their o-line problems or at least greatly improved it, the Rams have tons of talent, the Panthers still have Newton, etc. etc. Those teams have at least some critical parts of the team set with top level, proven talent.
This team, with the exception of the punter, does not...