Brady's DOB=8/3/1977
Jimmy Garoppolo=11/2/1991
Jacoby Brissett=12/11/1992
Franchise tag for QBs in 2016 was $19.953 million.
Likely franchise tag for QBs in 2018 is over $22 million.
In order to tag Jimmy G in 2018 the Patriots must first tag him which means
1.) his 2018 cap number at the start of the 2018 League Year will be $22 million.
2.) the franchise tag can't be used on Malcolm Butler or any other Patriot in 2018.
Brady's 2017 cap number = $14M including his 1 million salary. If traded before 6/2/2017 it would increase to $27 million. If traded in 2017 but after 6/1/2017 his 2017 dead money would be $13 million and his 2018 dead money would be $14 million.
Brady's 2018 cap number = $22M. If cut or traded before 6/2/2018 it would decrease to $14 million.
If traded in 2018 but after 6/1/2018 his 2018 dead money would be $7 million and his 2019 dead money would be $7 million.
Brady's 2019 cap number = $22M. If cut or traded anytime in 2019 it would decrease to $7 million.
The Browns are not the only team in the NFL in need of a quarterback that can help them win a Super Bowl. It is a false choice to contend that Jimmy G's only options to start are the Pats and the Browns.
Jimmy Garoppolo's 2017 cap number is $1,098,513 which consists of
$820,077 salary
$65,000 offseason workout bonus
$213,436 signing bonus proration (if traded this will remain on the Patriots cap)
Starting on January 2,2017 Jimmy G's rookie deal can be extended or restructured. Any extension or restructure will NOT impact the 2016 salary cap.
Unsure why Jimmy G would agree to one-year 10M deal in 2018 when if tagged he is fully guaranteed $22M.
Brock Osweiler received $37M fully guaranteed (18M APY)
Andrew Luck received $47M fully guaranteed. (24.5 APY)
With the cap increasing 8% a year let's split the difference and project a $42M fully guaranteed deal (22M APY) in 2018 for Jimmy G. One way to do that is to have small 2018 signing bonus and a large 2019 option bonus. Downside of doing so is that Jimmy G's cap numbers for the rest of the deal are in the 20M range.
Edited at 9:57 AM to add
Not sure why Brady would agree to be a backup in 2018/2019 when he can start elsewhere and earn $15 million in cash each year