I agree with your comments, I just happen to think that McCaffrey has the ability be special from day one, and take the offense to another level more than a first round OLB could help the defense. McCaffrey's foot work and agility are incredible. I think he would put as much or more pressure on the opposing defense to stop him as a first round defender could help the Packers defense shore up our defense.
If he's available, he should be the first RB taken by the Packers since Darrell Thompson in 1990. I'm telling you, if he stays healthy (always, right?), I think he will be a star in the NFL.