Obviously, it's impossible to know right now. That said, here are my best guesses based on the impressions I have of each player so far:
Lock. Present backup, future star, IMO.
Lock. Seattle felt an all-around 3-tech was their only need going into this draft. Hill is a low risk player. If he didn't make the team it would be a stunner.
Probable. This regime isn't afraid to ditch 4th round picks, and has quickly cut 4th rounders in the past. EJ Wilson didn't make the team in 2010. Kris Durham was juggled between the roster and the practice squad in 2011 and was gone completely a year later. Durham was a project. So is Harper. So there is some risk he could flame out.
Seattle is very deep at receiver on a roster that already has Percy Harvin, Sidney Rice, Golden Tate, Doug Baldwin, Stephen Williams, Jermaine Kearse, and Phil Bates. Bates and Kearse are long shots, but John Schneider was absolutely geeked when he signed Williams to a 2-year contract this winter and I think Williams sticks if he shows anything in the preseason. That makes Harper receiver #6, most likely. Will Seattle carry six receivers and five running backs? They did last year initially before changing their minds.
There are three factors working in Harper's advantage. The first is the draft pick investment and the fact that he's very cheap for another four years. The second is that at as a guy who runs a 4.5 forty at 230 pounds, Harper brings a unique skillset to the WR corps. The third factor is that Rice, Tate, and Baldwin might depart from the team in the next couple years, so Seattle wouldn't give up on Harper easily because they wouldn't want to regret giving up on him.
Lock, if healthy.
2013 is a make or break year for Red Bryant. After 2013, Seattle has very little dead money on Bryant's escalating contract, and there's a roster bonus due next offseason. If Bryant struggles, Williams gives Seattle the leverage they need to restructure, trade, or release him.
Williams also provides crucial depth as a run stopper in 2013. If Mebane goes down, Williams can step in. Williams is an elite run defender with freakish strength and straight line speed.
Simon will compete with Thurmond, Lane, and Maxwell for three corner spots. He's got a lot more physical talent than Lane and has more skill as a corner than Maxwell. If Thurmond gets injured and IR'd (please no), then Simon becomes a lock. I think Maxwell becomes the odd man out, then quickly signs with another NFL team five minutes later.
70/30 he makes it. Canada vs. Argentina.
Willson will have to battle for this spot with the basketball player from South America. Both are terrific athletes. Seattle seems to be looking for a deep ball threat at TE, and Willson is 6'5" 250 with a 4.51 forty time. He's probably the favorite going in. And though it probably doesn't matter, Willson gives a very good interview (he interviews like a coach), and usually players that interview like 10 year pros tend to end up 10 year pros more often than not.
I'm going to go on a limb here and call this one a lock. This wouldn't be fun if I didn't attempt a bold prediction.
I think Spencer Ware could be a starting RB in the NFL, maybe a very good one. He was arguably more talented than his LSU teammate Stevan Ridley. Ridley had 1,263 rushing yards for the Patriots last season. I know we have a ridiculous group of running backs already, but Seattle passed on some good players in the 6th round to get Ware even though he'd be our #5 RB.
Ware has the size to be a RB/FB hybrid and is a monster pass blocker who plays with Marshawn Lynch type effort and intensity. If you haven't seen Ware's highlights, you should really check them out:
That kind of talent rarely ends up getting cut. Consider too that Kregg Lumpkin briefly made this roster last year as a #5 RB before a roster crunch cost him his job. Lumpkin was a nifty player, but he wasn't close to as talented as Ware.
Michael Robinson is 30 next season. I don't think Seattle will feel comfortable about a full season and playoffs without some form of depth for his position, and Ware has the kind of talent to star on special teams and in spot duty. He'll be a fan favorite in the preseason. Robert Turbin might hardly see the field next year between Michael and Ware.
Seymour has a lot of competition- Seattle drafted or signed four guards yesterday. He's also perhaps the best candidate to earn a roster spot as he's the most versatile of the group and played the toughest competition in college.
If Seymour really impresses, he could make Paul McQuistan expendable. Releasing McQuistan would save $3 million, which probably explains why Seattle went hog wild with guards at the end of the draft's day 3.
Seattle also needs a backup tackle to replace Frank Omiyale.
Depends on Clemons. If released, Powell goes to the practice squad.
Powell has the talent to be a draft steal, but he's also making the jump from the lower divisions of college football and is going to a team that doesn't really have a spot for him if Clemons is healthy. I think Powell probably makes the team at first because I think it's likely Clemons will start on the PUP, and then I see him transitioning to the practice squad when Clemons returns. If he looks very promising in the preseason, Seattle might make a sacrifice elsewhere to stash Powell on the roster.
Longest of the long odds. Practice squad is a possibility.
Smith is another Sweezy type project from DT to G. Seattle will have 9 guards competing for four or five spots. Smith is among the least likely to win a spot.
Bowie was Russell Okung's successor at left tackle for Oklahoma State before transferring for violating team rules. If Bowie looks good, that could allow Seattle to part ways with McQuistan to save salary and if he looks really good, he might supplant Giacomini as a 2014 starter (Giacomini is a free agent after this season).
Of the undrafted free agents, I think Craig Wilkins (LB) has the best shot. He can play any spot in the linebacker group, is fast, and gets off blocks about as well as a linebacker possibly can.