I see there were several attempts to help you with the defensive scheme(s) explanations.
I saw no reply to the "waivered" question. It isn't terribly clear what you are asking but I thnk I can safely assume it has to do with waivers, or rather a player who has been placed on waivers thus waivered?:\
A player can be placed on waivers, that is released, and then other teams can place a claim on said player withthe player being awarded to the team with the highest piority. If another team does not claim the player that player may be reclaimed by the team releasing him usually for the purposes of using said player on a practice squad. This enables the player to practice with the team and hopefully increases his chances of making the team later in the year to fill in for an injured player or to simply gain experience. The team claiming a waived player must compensate the player's previous team using an established system. All available players not on waivers are considered free agents.
Which I also believe means if a player clears waivers (nobody claims him) he becomes an unrestricted free agent.
Hopefully that was not too convoluted. I believe a team's priority is the same as in a draft, that is the "weaker" team has the higher priority and after succesfully claiming a player moves to the back of the line(s) when trying to pick up other players.
Good luck!
RnD:r
GO RAMS!!:l