If you look at al the Hall of Famers who played for the Red Sox over the years - Williams, Yastrzemski, Rice, Doerr, Fisk, Boggs, Eckersley, Cronin - none of them ever won a World Series while playing in Boston. If Betts makes it to Cooperstown, he would be the first Hall of Famer who won a World Series as a member of the Red Sox since Babe Ruth in 1918. (Or the second, once Ortiz gets enshrined.)
I like having great players, but it's not always a recipe for success. Other than Ortiz, is there anyone else from the 2004, 2007, 2013, and 2018 teams that look like a surefire HOF candidate? Manny would be one but the steroid legacy might have drastic implications...