Tampa has a lot of work to do cap wise if they want to Keep that D and Godwin together.
Some moves are...
Cut one of Brate or Howard to save 6M.
Cut Gholston to save 5M unless he takes a pay cut.
Extend JPP and lower his cap hit to save 3M. He's going to be 32 next year though.
Extend Evans and lower his cap hit to save 3M
Extend Donovan Smith to save 2M
Extend Jensen to save 2M
Extend Brady to save 2M
That would bring their cap space up from 38M to 58-61M Meaning they can use anywhere from 55-58M to sign their guys with a little left over.
Front load the Contracts
Gronk 2 years 16M (8, 8)
Brown 2 years 10M (6, 8 if he hits incentives. So it be more like 2 years 14M)
Barrett 5 years 92M (14, 19, 19 20 20)
David 4 years 50M (11, 12, 13, 14)
Suh 1 year 7M
Succop 3 years 9M (2, 3, 4)
They really can't afford to let any of these guys walks. Suh is sneaky important for them, as he makes Vea's job so much easier an gives them the 4th guy in their very scary front 4.
All these moves will cost 48M next year leaving them almost no way to sign Godwin unless he takes a massively front loaded contract. And it isn't like they don't have depth peices worth signing like Gholston, Nunez-Roches, Haeg and Fournette potentially (if he's reasonably priced).
I don't see Brady letting Brown or Gronk walk. Barrett and Davids are absolute must signs, as is Succop. Maybe the plan is to let Suh walk or he will retire, but that hurts the strength of their D. Even if they somehow sign Godwin and keep Suh it would be at the expense of all their depth, and not 3rd stringers. Rotational guys who played serious snaps for you this year.
Don't get me wrong, if they can figure it out they should do it, but it just seems like it would be hard and they absolutely need to keep a good D as Brady ages. If they managed to keep all those guys but gut their depth DL depth in the process you know they are going DT in round 1, it's basically forced. And they need to hope they hit on a decent player.