Maybe he wanted the Packers to be able to get a closer look at him to find out why he is on his third team already at 25 years old. If he doesn't fit the locker room or the offense or it otherwise does not work out, I believe they can cut him before the regular season starts and get the draft pick back. As the week 1 roster is not actually official until week one of the regular season begins. So they would have a week and a half to decide.