But we are also talking about a 36 year old KG (with 18 years of wear and tear) vs a 31 year old Boozer (with 11 years of wear and tear). While their numbers come out as similar, KGs do still come out as better than Boozers even if its not by a significant margin.
How much of an impact does KG still actually have today vs the historic reputation he's built? Over their careers, KG's DWS/48 is 0.09. Boozer's is 0.07. Thats no small difference
Could it not be as likely be that Boozer's overall contribution to defense has been underrated for years, maybe even improving with experience, and while a worse defender than Garnett over their respective histories, Garnett age and injuries are just allowing that gap to close?
I'm not saying this is or is not the truth - but if we want to say we should question the numbers if they don't tell us what we think or believe or is common knowledge, we should be just as willing to question what we think or believe or the common knowledge if they don't match the numbers.