I own Williams in 3 out of 5 leagues, so of course I do like him, but I agree that his "legend" has really been built up on these boards.
Going from being an UDFA to a starting role in his rookie season is very impressive, but it did happen on a trainwreck of a team that could still add more talent at the position in this draft, and it's not like he dominated. He was very solid for a rookie and he looked good so I'm encouraged, but with that said it's likely a winning proposition to trade an NFL UDFA for an NFL first round pick, after one season, 85% of the time - especially when that first round pick really didn't get a chance to show much due to injury.