Last year the NFL practice squads had protection rules where teams could protect, 4 I believe, players from being taken by other teams and teams could elevate players twice a year to main roster without needing to expose them to being taken by other teams when they returned to practice squads. Dane Jackson was protected most of year which is why he was not snatched. Since they also put specific limits on amount practice squad players could be paid after some teams paid some PS players as much as 53 man squad (i.e. Denver) I found that a bit unfair to PS players.