PC Drunken Friar said:
There are examples though, of players numbers being retired by a team other than the "right" team, like the Boggs example, where the "right" team never retired it. Steve Garvey, Winfield and Sutter a few examples. That's the precedent you should be looking for, and it is there. Not the narrative that Boggs and Gossage are the only ones without being retired.
I'll push back a little on Winfield. Higher WAR with the Padres, plus he came up with them, which I think counts for something. Sutter, you're right, was better for the Cubs, but probably shouldn't be in the HOF anyway. He's a much lesser version of Gossage. Garvey, yes, it's silly that the Padres retired his number. But he's not in the HOF, nowhere near the player Boggs was. If that's the best case, that underscores my point.
Without getting bogged down (pun unintentional) in semantics, the challenge is to find a situation that closely parallels Boggs' number not being retired by the Red Sox. Modern player, slam dunk HOFer who produced the large majority of his value with one team, and said team does not retire his number. I cannot, and I believe there are none. The closest I could find are Alan Trammell, Lou Whitaker, and Dwight Evans. But HOF counts for a lot, and, fair or not, none of those guys are not in or ever really came close. And in those cases, the issue is they were falsely regarded as merely "good" players. Boggs, in spite of many not grasping the vale of his walks, sill got 91.9% of the HOF vote his first year. Everyone more or less agrees he was a great player. Yet here we are.