Johnathan Hankins signs with Colts: What's next for Giants?

The defensive tackle's long free agency saga came to a close Thursday when he signed with the Colts, according to ESPN, ending any possibility of a return to the Giants a day after the team's offer finally emerged.

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Hankins signed a three-year, $30 million deal with $14.5 million guaranteed, according to ESPN's Adam Schefter. NFL Network's Ian Rapoport says the deal gives Hankins $15.9 million guaranteed, and $10.5 million in cash flow in the first year.
The Giants made Hankins an offer - reportedly for four years and $28 million (guarantees and structure unknown). They patiently kept it on the table as he shopped around for over a month, trying to land a better deal - which he apparently has.
So what does this mean for the Giants? Here are some quick thoughts:
The Giants should be disappointed, but not devastated. Hankins is a good player. He's not a great player. The Giants were smart to not meet the exorbitant demands his agent, Kevin Poston, was reportedly making. Of all the talented young players the Giants will try to re-sign in the next few seasons, Hankins was one of the most expendable. If they could have re-signed him at their price, great. They weren't able to, though, and now they move on.
Side note on Poston. The agent, who took an awful lot of heat, definitely deserves credit for staying the course and getting Hankins a good deal. That being said, the structure of this deal will be key, as will be how much is actually guaranteed in the end.
Comp pick coming? Yes, the Giants should get a compensatory NFL Draft pick in 2018 with Hankins leaving. It will likely be a fourth- or fifth-round pick.

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And then there was one. With Hankins leaving, left guard Justin Pugh is the only player from the 2013 NFL Draft class still on the Giants' roster. Only Hankins and Cowboys defensive end Damontre Moore (and everyone knows that story) are currently on other NFL rosters.
On the roster. The Giants have an opening at one of their starting defensive tackle spots now. They have two tackles on the roster (in addition to Damon Harrison): Jay Bromley and Robert Thomas. Bromley, a 2014 third-round pick, is entering a make-or-break contract year. Thomas flashed as a pass rusher in limited snaps last year after missing several weeks with an illness. Both players could be given a shot to win the job in training camp.
Free agency? There are not a whole lot of veteran options out there. The Giants have shown some interest in ex-Jaguars defensive lineman Jared Odrick, according to a person with knowledge of the situation. Odrick is likely the best player still on the market. Ex-Broncos defensive tackle Vance Walker and former Giant Cullen Jenkins are also free agents.
NFL Draft. The Giants were likely to draft a defensive tackle no matter what happened with Hankins. The position may pick up more importance now, though. One name to watch: Florida's Caleb Brantley. There's a chance he could be on the board for the Giants in the second round.
Unless Alabama's Jonathan Allen has a major fall, the Giants are unlikely to get a first-round defensive tackle. Michigan State's Malik McDowell is a buzzy name, but he has off-field red flags, and he may be a better 4-3 fit at defensive end.