How many roster openings do the Seahawks have?

It's a numbers game and Seattle's roster is close to being full already, so how many roster spots can they actually draft for this year?

I read a mock draft that had the Seahawks trading down so many times this year that Pete Carroll and John Schneider wound up with TWELVE new draftees, not counting all of their priority free agent signings. It made me ask: Can Seattle even do that?

NFL teams have 53-man rosters and even if new league rules allow for expanded rosters and practice squad te…