I had thought of using Hall of Fame as the main criteria of defining elite at my earlier post, but after looking at what QBs had become Hall of Famers (there are only about thirty of them) so I am wondering if using entry to the NFL Hall of Fame might be a bit out of date in describing today's possible elite QBs (It's very obvious that how the game is played has drastically changed from twenty years ago, and younger QBs are starting to put up some incredible numbers compared to QBs of ten or twenty years ago.)I do agree that consistency is huge factor to be considered elite, but I am not sure that there is one surefire quantifiable definition of elite.http://www.profootballhof.com/hof/positions.aspxPre-Modern Era: Running Backs and Quarterbacks (24)Cliff Battles (HB) 1932-1937Sammy Baugh (QB) 1937-1952Tony Canadeo (HB) 1941-1944, 1946-1952Earl (Dutch) Clark (QB) 1931-1932, 1934-1938Jimmy Conzelman (QB) # 1920-1929John (Paddy) Driscoll (QB) 1920-1929Bill Dudley (HB) 1942, 1945-1951, 1953Benny Friedman 1927-1934Harold (Red) Grange (HB) 1925-1934Joe Guyon (HB) 1919-1925, 1927Arnie Herber (QB) 1930-1940, 1944-1945Clarke Hinkle (FB) 1932-1941Earl (Curly) Lambeau (HB) # 1919-1929Alphonse (Tuffy) Leemans (HB-FB) 1936-1943Sid Luckman (QB) 1939-1950George McAfee (HB) 1940-1941, 1945-1950John (Blood) McNally (HB) 1925-1938Bronko Nagurski (FB) 1930-1937, 1943Ernie Nevers (FB) 1926-1927, 1929-1931Clarence (Ace) Parker (QB) 1937-141, 1945-1946Fritz Pollard (HB) 1919-1926Ken Strong (HB) 1929-1937, 1939, 1944-1947Jim Thorpe (HB) 1915-1917, 1919-1926, 1928Steve Van Buren (HB) 1944-1951 Modern Era: Quarterbacks (23)Troy Aikman 1989-2000George Blanda (Also PK) 1949-1958, 1960-1975Terry Bradshaw 1970-1983Len Dawson 1957-1975John Elway 1983-1998Dan Fouts 1973-1987Otto Graham 1946-1955Bob Griese 1967-1980Sonny Jurgensen 1957-1974Jim Kelly 1986-1996Bobby Layne 1948-1962Dan Marino 1983-1999Joe Montana 1979-1994Warren Moon 1984-2000Joe Namath 1965-1977Bart Starr 1956-1971Roger Staubach 1969-1979Fran Tarkenton 1961-1978Y.A. Tittle 1948-1964Johnny Unitas 1956-1973Norm Van Brocklin 1949-1960Bob Waterfield 1945-1952Steve Young 1985-1999