Season 1: Drafted or traded for Colt Brennan. Declared as keeper at the end of the year.
Season 2: Kept Colt Brennan. Declared as keeper at the end of the year.
Season 3: Kept Colt Brennan. Dropped or traded Colt Brennan during or after the season. Did not declare him as a keeper.
Season 4: Can trade for Colt Brennan, but cannot send back any players involved in the original trade.
Season 3: Team A trades Colt Brennan and Devone Bess to Team B for Peyton Manning and Larry Fitzgerald. Totally fair.
Season 4 draft is held. No trade backs between Team A and Team B involving any of the players listed above.
Season 4: Team A can trade for Colt Brennan, but cannot send Team B Peyton Manning or Larry Fitzgerald back in the trade.
Team A can now keep Colt Brennan 2 more consecutive years.