Fangraphs and Baseball-Reference are unanimous in naming Boog Powell the top Oriole without a retired number, although by how much differs. Baseball-Reference gives Powell 35.9 bWAR for his time with the O’s, good for seventh all-time among the franchise and just below Wallace (39.1) and Williams (36.0). Fangraphs is much more charitable to number 26*, giving him 50 fWAR for his time in Baltimore; that puts him behind only Ripken, Brooks Robinson, Murray, and Sisler in the history of the team. That, combined with playing on four pennant winners, might be enough to get his number retired.
*As a side note, Powell wore 30, 16, and 8 as well with the Orioles, but 26 is the only one he wore for more than one season.
The biggest problem with that is that he’s been retired since 1977, and there hasn’t exactly been a groundswell movement to retire his number. Maybe someday (at this exact moment in time, I put him as the second most likely retired number candidate).
Paul Blair and Mark Belanger, both Powell teammates, are both close to Powell in value. Blair and Belanger have 43 and 41 fWAR to Powell’s 50, making them the next two Orioles. They’re next in bWAR as well, but with 32.7 and 32.6 bWAR, respectively. Most of their WAR comes from defense, though, which is a little harder to quantify. Also, like Powell, it’s been some time since either one has played. It isn’t like 6 and 7 earn statues any time soon (or, in the case of 7, it probably won’t be for Belanger). Retired players following these two in value (Brady Anderson, Bobby Grich, Ken Singleton) all had good seasons, but, for various reasons, are even less likely to see their numbers retired.