A lot of the way the draft will go depends on how the front office handles free agency. I wouldn't pass on drafting either of Josh Doctson or Joshua Perry with the 2nd round pick. It wouldn't surprise me if both went in the first round even.
If the don't resign Okung, then a tackle in the first makes the most sense. If they do re-sign Okung, the best center on the board makes sense, too.
If they don't re-sign Kearse, WR Josh Doctson fills the role of a big target who can catch over the middle and also fits in the offense down the field. The value is too good to pass on in the 2nd round.
And if they don't re-sign Bruce Irvin, I'm really hoping for LB Joshua Perry to fall to the 2nd round pick. I think he's one of the more underrated players in the draft. He doesn't run 4.5, but he more than fast enough to play coverage and he's got the size to hold up extremely well on the line of scrimmage. He's already making hawk tackles playing for Ohio State and he's got the NFL size to play day 1 at SLB.
I like Alex Collins a lot. Late 2nd round is about his value, too. If Seattle has RB on their board that they have to have on the roster then I'm good if they want to double down at the RB position with Thomas Rawls and a high draft pick. I do hope they wait later the 3rd or 4th round to draft a RB, tho. A player I'm keeping an eye on is Alex Collins' ex-teammate at Arkansas, Jonathan Williams, who missed 2015 with a foot injury. He was an elite RB his junior year who could be a mid round surprise pick, assuming he's at 100%.
I wasn't much impressed watching Robert Nkemdiche tape, so at #14 that too high for me. He looks like a 3rd round pick to me. To a 3-4 defense maybe a little higher. I see him in a lot of first round mocks, tho.
Another guy I like that you have in this mock is LB/DE Kamalei Correa. He's really a good football player who could play the edge for us, either as a LEO or SLB or even both like Bruce Irvin did. He reminds me a bit of Clay Matthews. If he runs faster than 4.7 he's a prospect I'd like at #56.