I would be shocked if Jackson, Espensa or Wirfs stayed another year. All three are potential 1st rounders. Second round wouldn't be a complete surprise. Wirfs ranks below Jackson but his size is going to get him a lot of offers. He's a solid player. Not the stand out that Jackson is, but he's no slouch.
AJE could use another year to really get on his game. But even at this point he is a late first rounder, second rounder. Our only hope is his childhood love of the Hawkeyes.