"That's the mystery of it, sort of the intrigue," general manager Ted Thompson said Tuesday after Young completed his first practice in a Packers uniform.
The Packers are hoping that Young, out of football last year after being cut by the Buffalo Bills, can pick up the offense quickly enough to make a serious run at the backup job behind Aaron Rodgers.
After five up-and-down years as the Tennessee Titans' starter and one year as a backup to Michael Vick with the Philadelphia Eagles, Young says the Packers are getting someone who has experienced both success and failure on the field (31-19 career record as a starter, two Pro Bowl selections, a 74.4 career passer rating) and has grown up off the field while getting married and trying to navigate through financial problems.
"Back in the day, I was a young Vince. Now, I'm more mature and definitely learned from things that happened in the past," Young said. "I'm married now, a grown man, 30 years old. I've definitely been through the highs and the lows and different things like that. It's the way you come out of it to stay strong. I'm stronger than I've ever been."
Young doesn't have much time to learn the playbook and make an impression, but said he isn't fazed by the odds being against him.
"(It's) no challenge. I've been through pretty much everything you can think of," Young said. "I'm just happy, enjoying this and just happy to be here and being here with some special, special guys. My whole thing is to continue to keep working and get myself better and just staying ready — you never know."
Harrell was solid but unspectacular during the first 10 days of training camp and Coleman, a seventh-round pick in 2012 who spent last year on the practice squad, did little to impress his coaches. He threw a pair of interceptions in practice on Thursday and did so again in Saturday's scrimmage. One interception came in the end zone; another was returned 66 yards for a touchdown.
"We're adding more competition to the room," coach Mike McCarthy said. "I thought (Saturday night) was one of the better scrimmage-type environments that Graham has performed in. B.J. did not take the step that I was hoping for, but he's a young player. I'm not giving up on B.J. Coleman because I think he has, definitely a future, a bright future. (So) that is a room that there will be more competition. And Vince Young was available."
McCarthy said he wasn't sure whether Young would know enough of the playbook to see action in the team's preseason opener Friday night against Arizona, although the coach said he hoped Young could play.
Young, who is listed at 6-foot-5 and 230 pounds on the Packers' official roster, appeared to be in good shape, even though he acknowledged he was rusty. McCarthy made it clear that Young wasn't brought in merely to run read-option plays on the scout team against the No. 1 defense, and that the coaches had already started tweaking his fundamentals.
"Vince Young is a very talented player. You look at his history, it speaks volumes about his ability to play. It's just a matter of getting comfortable with him," McCarthy said. "We'll have to teach him the language and get him up to speed."
Young's comeback attempt began with him participating in Texas' pre-draft pro day, and while he said he had other teams show interest in him, Green Bay was the right place for him to resume his NFL career.
"I'm still fighting and I haven't quit," Young said. "I really feel like that year off really helped me out a lot. It opened my eyes and a lot of things like that. I'm just happy to have the opportunity to play here. Right now, I'm just taking it day by day, trying to get a grasp of the offense, ask questions, kind of pick Aaron's and the rest of the guys' heads so I can try to catch up to speed with the guys."