not signing hertl to a 6x6.5m contract would probably help make it easier

Buch gets more

Not resigning Blackwell? Or Rooney?
Trade Trouba and give those guys their monies.

They need 2C. Lot of Rangers fans want him

Cap situation still looks rough

Rooney is coming to NJ

Buchnevich gets more, but Kravtsov gets signed for only 1 year for less money, so it evens out. If Zibanejad wants more than a 5 year contract? Rangers let him walk away as a UFA. Maybe Strome is signed to a 3 or less year contract or he'll walk as a UFA.

Maybe the Rangers trade a current roster player for a center? Maybe Blackwell consistently plays like he's playing now for the rest of this season and next season and is resigned? Maybe a center prospect or a few center prospects prove they belong in the NHL over the next two seasons?

It's hard to predict what the Rangers cap situation will look like after this season and next. If the Rangers are in fact up against the cap in two years time they will be just fine. They have lots of tradable assets to get them under the cap and fill any holes (if any?) at center.

They have alot of NTC/NMC and I doubt most of them would waive to get out of NY.

I count only 4 full NTC/NMC - Panarin, Zibanejad, Kreider, and Trouba. And Kreider and Trouba become modified in a few years.

How can you tell?

It happens to be listed on the teams page between the players position and number of years term. You could then see the details of the NMC/NYC by clicking the player and going to the players page. It's listed in current contract between transactions/trade history and contract history.