As the Bears opened their three-day rookie mini-camp Friday, Juice Williams was one of the high-profile names on the 54-man roster, although he was invited on a workout basis only. Williams would be the first to admit the transition wasn't exactly seamless as he sailed passes too high and missed some of his targets low. "Early on, it was a different,'' he said, "with the new concepts and stuff going on. But as practice went on, I felt a little bit more comfortable, like with the 7-on-7 drill. I just have to get used to the speed.'' Williams said he doesn't have a "chip on his shoulder'' after going undrafted. He just plans to make an NFL roster somewhere and is willing to switch positions. "Quarterback has always been my desire growing up, but if a position change comes around that's best for the team, I'm all for it,'' he said. "I'd play anything ? receiver, running back, anything.''