It's intriguing right now.
Dekkers is the clear starter if he's able to, that we won't know for a bit.
Rocco is a bit more of a run-pass-option guy. He can spread the field and extend plays more than Dekkers but doesn't have quite the arm strength of Kohl. He has probably the least amount of poise between Dekkers, Kohl, and himself, but still pretty good.
Kohl is impressing the hell out of everybody with how quickly he's picking things up and looking competitive. He's more of a pass-first guy with similar, somewhat limited mobility, to Dekkers. Guy is the future of the position, it's just a matter of timing.
Hughes is thought highly of because he has a ton of experience and can extend plays with a below par OL. He's more mobile than even Rocco but doesn't have quite the arm of either Dekkers or Kohl. He's picking things up pretty quickly and may play a lot more than many expect.
Because of some of the limitations of our offensive talent, I believe the order of starters right now would be Dekkers, Rocco, Hughes, Kohl. Depending on how camp goes, Hughes could jump Rocco just from an experience standpoint, though less high of a ceiling. Kohl is the "best" of them all in terms of ceiling, but he's a true freshman and it's going to be hard to start somebody in that position with a weak OL, even if better than last year.