I have to agree with Rob on this one. While I'm no expert or tape junkie, I like to think that my years of fandom combined with voracious reading and dabbling in film give me a decent idea of a prospects ability. And what I see in B. Williams is an athletic big man with little or no experience against even average offensive line talent. I believe this will lead to at least one year as a rotational player in order o learn the game.
Generally when a team spends first round draft capital on a player, they expect them to contribute right away. Imho, B. Williams is D. Poe lite, and in the case of Dontari Poe, whose athleticism was off the charts, Kansas City decided he was worth waiting for.
I don't think B. Williams is going to test as well at the combine, so he won't have that wow factor that makes a team forget all about their hours, weeks and months of scouting in order to draft a man that looks good in shorts.
So personally, I think he will last until the 3rd round based on small school status and because of Poe,who only managed to accumulate 38 tackles, 0 sacks, and 0 forced fumbles.