You need to submit a qualify offer to put him into restricted free agency. If you dont he is unrestricted and you can't match any offer.
I know it sounds dumb to even worry about matching an offer for SJ. But you have to submit those offers in the summer. So what if they don't and he explodes next year? And then he's unrestricted and you can't stop him from leaving. Bad business.
Plus the 5th year QO isn't like the 3rd and 4th year extension options. Extensions can't be retracted. A QO can be pulled before he signs it if the team wants.