BG said in his interview at the Combine that it's all a giant puzzle that you have to fit together.
A LOT of what they could, or maybe can't, do will hinge on what they decide about doing with Nelson/Cobb/Matthews. If they keep all three of them this year, and at their current cap numbers it will likely force them to push guaranteed money for Rodgers into 2019 and beyond (I'm thinking large signing bonus that can be pro-rated over life of the contract plus guaranteed money that hits the cap in 2018 (lesser)-2019 (bigger)-2020 (real big).........maybe even in 2021. All depends on how much guaranteed money will be in the contract.
If they keep Nelson/Cobb/Matthews "as is", it will also handcuff them as to what they can do in free agency (2018). Which would mean that any
meaningful forays into free agency wouldn't likely happen until 2019 and beyond. It would mean, for the most part, another year of maintaining D&D status quo.
2019 free agency, and beyond, looks to be less of a hindrance (at the moment) than does 2018.
Free Agents 2019:
UFA - Matthews, Cobb, Nelson, HHCD, Kendricks, Randall, Rollins, Monty, Ryan, Hundley, Ripkowski.
RFA - Hawkins, Brice, Evans.
ERFA - Day, Thomas, Pearson, Tonyan, Bouagnon, Kumerow, Amichia, Yancey, Triner, Gilbert, Byrd.
Free Agents 2020:
UFA - Rodgers, Daniels, Bulaga, Crosby,
Clark, Spriggs, Fackrell, Lowry, Davis, Murphy, Martinez.
RFA - Pipkins, Vogel, Odom, Talley. (They can pick up Clark's 5th year option here and keep him from UFA. That would push him out to 2021 as a UFA)
As you can see, what they do/don't do with Nelson/Cobb/Matthews in 2018 will have an effect both this year and 2019. So the size/scope of Rodgers contract likely won't come into focus until after the wrangle the numbers for these three players and make their moves in free agency.