K’Waun Williams has quite the free agent tour set up for himself. In addition to visits with the Lions and Jets, Williams is also slated to visit the Dolphins, 49ers, and Vikings this week, according to ESPN.com’s Michael Rothstein (on Twitter). Of course, those visits could also be 86’d if Williams immediately strikes a deal with either Detroit or New York. 
Williams arrived in Detroit on Monday and will touch down in the New York/New Jersey area on Tuesday night. If he doesn’t have a contract after wrapping up his visit with the Jets on Wednesday, he’ll continue meeting with clubs.
As a rare February free agent, Williams has a bit of added value for teams who are looking into a low-cost solution at slot cornerback. Williams’ next deal is likely to come as a one-year pact, so he is presumably looking for a situation where he can maximize his playing time and increase his value for next offseason. He probably won’t get a fully guaranteed roster spot, but he could conceivably get a small partial guarantee on his salary if enough clubs show interest.
Williams had surgery to remove bone spurs in his ankle back in November. He recently received full clearance from Dr. Robert Anderson.
What about him would make him such a catch for the Vikings?
Why would the 49ers be interested in a 5’9″ DB who’s hardly played in the NFL, when they’ve got a bunch of DB’s already that play at his level?