I dont think bosa would have an immediate impact
Running backs and linebackers are much more effective as rookies than players at other positions other than return men on special teams. Next would be WR's and QB's.
Pretty simple answer, both positions are very much reliant on instincts and reaction time. Unlike a quarterback, an offensive lineman, or a wide receiver, the playbook does not expand a whole lot for a running back in transitioning to the NFL. Certainly adjustments need to be made – new blocking assignments, an increased role catching passes out of the backfield, etc. – but by and large running backs are relying on good blocking up front, an ability to quickly assess a situation and react to it, and their own physical gifts. Yes, the defense will be better prepared and conditioned than most they will face in college, but key attributes for running backs like speed and agility tend to peak early on in their careers.
Similarly, the linebacker position relies on an ability to react and hit the hole. The factors that contribute to making that hole may be more complex, but the reaction time is still the same. Whether it’s figuring out a blocking scheme or adjusting to play action, linebackers are forced to rely on their instincts more than almost any other position, and while experience will certainly fine tune those instincts, for the elite young linebacker, those instincts are already there.
If we want immediate contributions figure out the best RB Elliot or Henry and best LB Jack, Ragland, Smith(2017)
I assume at Valley Ranch they have made their mind up on the QB situation if not we are in trouble come the draft. It is now the Jerry smoke screen time of the year.