Historical clue formulations

• Team that moved back from St. Louis in 2016, informally — 2022-12-24
• Hall-of-Famer Merlin Olsen and others, informally — 2015-10-23
• They used to play at the Big A — 2011-07-09
• Former SoCal N.F.L. team — 2011-05-15
• They moved to St. Louis in '95 — 2011-05-07
• N.F.L. team that featured the Fearsome Foursome — 2005-04-02