RE: Tweaking the post-merger NFL divisions
I'd say go full geographic, but within the conferences as they were constituted in 1970.
AFC East: Boston Patriots, Buffalo Bills, Miami Dolphins, New York Jets
AFC Central: Baltimore Colts, Cincinnati Bengals, Cleveland Browns, Pittsburgh Steelers
AFC West: Denver Broncos, Houston Oilers, Kansas City Chiefs, Oakland Raiders, San Diego Chargers
NFC East: Atlanta Falcons, New York Giants, Philadelphia Eagles, Washington Redskins
NFC Central: Chicago Bears, Detroit Lions, Green Bay Packers, Minnesota Vikings, St. Louis Cardinals
NFC West: Dallas Cowboys, Los Angeles Rams, New Orleans Saints, San Francisco 49ers
In 1976, Tampa Bay joins the AFC East and Seattle the NFC West, as Muskie has it. None of the relocations between 1970 and 2002 require teams to switch divisions/conferences, though the Phoenix/Arizona Cardinals remaining in the NFC Central is awkward. Then in 1995, Carolina joins the AFC Central and Jacksonville joins the NFC East. Before the 2002 realignment, we have this:
AFC East: Buffalo Bills, Miami Dolphins, New England Patriots, New York Jets, Tampa Bay Buccaneers
AFC Central: Baltimore Ravens, Carolina Panthers, Cincinnati Bengals, Cleveland Browns, Indianapolis Colts, Pittsburgh Steelers
AFC West: Denver Broncos, Kansas City Chiefs, Oakland Raiders, San Diego Chargers, Tennessee Titans
NFC East: Atlanta Falcons, Jacksonville Jaguars, New York Giants, Philadelphia Eagles, Washington Redskins
NFC Central: Arizona Cardinals, Chicago Bears, Detroit Lions, Green Bay Packers, Minnesota Vikings
NFC West: Dallas Cowboys, New Orleans Saints, San Francisco 49ers, Seattle Seahawks, St. Louis Rams
And in 2002:
AFC East: Baltimore Ravens, Buffalo Bills, New England Patriots, New York Jets
AFC North: Cincinnati Bengals, Cleveland Browns, Indianapolis Colts, Pittsburgh Steelers
AFC South: Carolina Panthers, Miami Dolphins, Tampa Bay Buccaneers, Tennessee Titans
AFC West: Denver Broncos, Kansas City Chiefs, Oakland Raiders, San Diego Chargers
NFC East: Atlanta Falcons, New York Giants, Philadelphia Eagles, Washington Redskins
NFC North: Chicago Bears, Detroit Lions, Green Bay Packers, Minnesota Vikings
NFC South: Dallas Cowboys, Houston Texans, Jacksonville Jaguars, New Orleans Saints
NFC West: Arizona Cardinals, San Francisco 49ers, Seattle Seahawks, St. Louis Rams
Which is the same as Muskie's, except Baltimore and Miami swapped divisions, as did Atlanta and Dallas. My thinking on the former difference is that Miami and Tampa Bay could easily have developed a strong regional rivalry in the same division and so may want to stay together, even if moving to a new division. The latter difference is simply due to the original merger lineup being different.
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