@ Board Bard from previous thread...
"You've basically replaced a cheaper, arguably better (or better-to-be) Connor with Stone. Who are you getting rid of the next year when Morrissey gets a $5M/yr. raise?"
No, I've replaced Connor with Stone and whatever assets you can acquire for Connor. So, for example, if Connor returns Pesce and a 2nd, you get Stone, Pesce and a 2nd for Connor. Or, if you trade Connor for a 1st and a top prospect, you get Stone, a 1st and a top prospect for Connor.
Signing Stone as a UFA gives you a prime asset for nothing except cap space. Trading Connor gives you additional assets.
The cap would be very tight, if not impossible in 2020 if both Morrissey and Trouba were signed at $8M per season. But, if you could shave a bit off from either of them and the cap goes up by another $3M next year (to $86M), the Jets might be able to do something like this...
If Trouba is replaced by a D with a lower cap hit (like Pesce), the Jets could probably manage. Niku would be two years better than now and possibly ready for a top-4 role, and Samberg would likely be ready for a bottom pairing role by 2020, too.