LOL....4th round. Where do you get that nonsense. Look at ten draft boards and you'll see huge discrepancies between where players are rated. I created a spreadsheet to track it. Some boards might rate a player in the 300's while others have him Top 80. If you only look at one board, you're looking at an incomplete picture. Once you study a bunch of them, you'll start to see where guys value really is.
Many observers felt Crownover was the best Olinemen at the Senior Bowl. He's 6'7" 330 lbs with 35" arms. He started his career as a TE and DE which tells a story of his athleticsm. He's very similar to Max Iheanachor.