johnson was actually the opposite, he was projected as a top 5 or 10 pick before the season and while he had what id say was a very respectable season he has fallen due to not living up to the huge expectations he had.
add in the fact that people say he lacks heart and desire for some reason he has fallen and many other people have risen like maybin
i think he is well worth the #18 pick with his potential, i mean he WAS productive in college and is a physical freak that you need as a rush LB and he can cover TEs and RBs out of the backfield