Option 3 is most likely the case. Basically without DZ the Rangers are icing two stretch 4's in Moore and Stralman, and a no 7 in Falk. I know Mac Truck, Staal, and G are great, but man oh man is that defense thin on difference makers after you get past those three.
With DZ getting the Ballard treatment, the team knows he will eventually want out because of what it will do for his contract, so then it allows a trade to take place without fan backlash in case it's another Tyutin for Zherdev.
OTT wants out of the Greening contract, and Gryba may be the premium they pay, then I'd move pieces to make a trade, but not give up a guy that can give upper echelon minutes to fill two needs. Basically no to Greening, Gryba for DZ.
Zibanejad is a RH version of Miller. A young big bodied athlete that is too good for the AHL and not fully ready for the NHL. Happens with a lot of good kids that are two seasons out of their draft year. But say the package was Greening, Gryba, Zibanejad for DZ + Pyatt/Pouliout/+, then I'd consider since that fills multiple needs, and there is atleast a prospect with upside coming back even though its not a top 4 D or top 6 forward.
If it's Dallas: I'd ask for Chiasson + Robidas.
I know the futurists have a thing for youth, but in a capped league no team is going to trade away top tier controllable contracts; ie good young players who are legitimately good at the NHL level unless they were giving up on them for whatever reason. In other words you aren't going to get the best guy in their system by a longshot.