With Mathew Barzal, Devon Toews, and Ryan Pulock needing new contracts the likelihood of the Islanders going out and being able to add a top free agent is going to be extremely difficult. Heck, even adding a veteran via trade is going to be tough without the help of compliance buyouts.
If we're operating with the assumption that Mathew Barzal, Devon Toews, and Ryan Pulock will combine for a cap hit somewhere around $19 million for next year, there won't be much of any room left to add.
Without a doubt, the biggest need for this team is additional offensive support.