If you say he is a bust but then becomes good-great after 3 years of playing what does that equal? It just means your wrong, BUST is a label of being done and over-with, a failure. He isn't officially a failure yet. You could say his first 3 years were shitty due to plenty of factors, but those factors show anyone with insight he isn't one you can write off just yet. You can say you think he will be a bust, but the evidence on that is a lot weaker than the media and your opinion would like to believe.
Ryan Clady is a different player in from a different situation who was also a higher rated prospect. Because player X did something doesn't equate to anything. Comparing him to X is useless at this point. Williams play for the future is what you compare.
If you actually followed the reports also, you would know the medical issue was never minimal. It was reported by Mike Mayock that 2-4 teams took him off their draft board because of his medical report. Most teams realized it was one issue and even with it, Chris Williams had never missed a game nor a single practice at Vanderbilt ever! Despite that, Williams was still more of a project player. The bears management probably made a stupid move by moving him to RT and Omiyale to LG when neither are fits for those positions but much better for the opposite ones. Maybe seeing former analysis of Williams likely future would show you how it doesn't mean he is a bust nor a possible good LT
NFL Events: Combine Player Profiles - Chris Williams
"Williams might be a better fit at guard early in his career, so as not to expose him against speedy edge rushers. He can mirror the quicker defender in the short area, but he is marginal taking on second-level defenders and needs to improve taking proper angles when working in space. He has the frame to get bigger, but needs to play with more tenacity. He is a smart student, but will miss a few assignments due to mental lapses. With just adequate hip snap, he would be a liability starting at left tackle as a rookie, but he has the makeup, size and desire to improve."