Last year I produced a couple of forum posts analysing the progression system and how to un-retire players and aim to do the same for M17. I'm going to post all my different tips and theories in here as I try to answer a lot of the Q/A thread questions and it'd be nice to have a single place if anyone has any questions regarding the info here.
Enjoy

M17 Player Progression
Un-retiring Players
Owner Creation Tips
Coaching Carousel
Moving Players, Backup regression and Season Goals
Player Archetypes
QB THP Regression
Player Scheme OVRs
Draft Class Archetypes
Practice Squad Contracts
Player XP and OVR Over Time
Depth Chart Archetype OVR
Icing your own Kicker
Rookie "Grey Picture" Change
Player XP Development Dilemma
Practice Squad Stealing Caps
Adjusting Player Weight
Advancing weeks: Ticker, Set vs Random Games
Injured Rosters: Preseason vs Active, IR Bug
Draft Class: Group X & Group Y
Dynamic Development Lottery
Post-Draft Free Agency
Shameless plug for unrelated articles:
Position Flexibility Idea

And they moved it to the back of the attributes list in the Roster Menu
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