The NFL isn't college, night and day between them....the NFL is about measurable's and skill set, just because you played left tackle in college, doesn't make you a left tackle or right tackle in the pros, and just because you played corner in college, doesn't mean you can right corner in the pros..prime example of that is Zach Martin, played his entire career at ND as a left tackle but his measurable's and skill set makes him an all pro right guard in the pros.....Byron Jones, corner in college, safty in the pros......Offensive linemen aren't interchangeable, too many people on this forum think offensive linemen are interchangeable based on what a player did in college, THEY ARE NOT!!!!
And with regards to Dak do you really think he'd be as successful if he played for Cleveland last year, he's a product of the talent surrounding him, it wasn't all on his shoulders, and he played Qb in college, we're not talking about him now playing corner or defensive end, he's still playing QB based on his measurable's and skill set...
and the equivalence between asking a left tackle to play right tackle is like asking Dak to switch from throwing right handed to left handed...