I think you will be surprised by Lewis. He's a legit first-round talent. His issue is he is raw in some areas so at this point he's a situational pass rusher. Kiser ran a 4.66 prior to the draft which is fast for a guy that is 6' and 244 lbs. That is what most SS run, for example, Jordan Fuller timed at 4.67 and he's 6'2" 202 lbs. Cory Littleton ran a pedestrian 4.73.
Okoronkwo isn't fast (4.77), isn't explosive, and is a one-trick pony with his bullrush. That is why he dropped. Many felt his talent wouldn't translate in the NFL without a few years of work. At this point IMO he's #3 on the depth chart at DE. He lacks the speed to play JACK or SAM. He showed he was a liability in coverage last year. As an example, Jonah Williams is a prototypical DE at 6'5", 275 lbs, 30 bench reps, and ran a 4.67. If Williams practices like his game films then Okoronkwo could be on the bubble.
Don't get me wrong I like Ogbo but he needs to separate himself from the pack and frankly, I don't see him beyond a backup role. Now look at Lewis and you see a prototypical JACK LB who can rush the passer, or drop into coverage. Not just zone but also man coverage. Just watch his games and you will see a true first-round talent who dropped due to injury concerns. He could end up being the steal of the entire draft if he stays healthy. It's not even close to who has the most talent between Lewis and Okoronkwo.
Let me put it this way. Pit Havenstein against Okoronkwo and I bet Rob wins most if not all the snaps. Now put him against Lewis and Terrell will beat him 9 times out of 10. Lewis is fluid, agile, explosive, and fast with good hand play, all the things that a lot of OTs struggle with. Okoronkwo hasn't shown any of that. If an OT locks onto Okoronkwo he usually stays that way.