I think most people would just automatically assume that Nomar Garciaparra is the greatest Red Sox SS of all time. However, is there a case that it's actually Xander?
fWAR through age 28:
Nomar: 32.8
Xander: 31.6
If 2020 was a full 162 games, Xander would most likely have a higher career fWAR. We complain about Xander's defense, but Nomar was actually a much worse defender. Instead of working on his D, Nomar spent more time complaining about the grounds crew.
Xander played in 2 WS. Nomar played in 0.
By all accounts, Xander is a wonderful teammate. I'm not sure anyone could say the same about Nomar.
Xander may never have an amazing season like Nomar had in 2000, but is the overall package better than what Nomar gave us?
Yes, Johnny Pesky would be in the discussion if not for WW2.