Other than Brady, how many aging quarterbacks won SB's?They're finally drafting some offensive linemen, but what have they done that would actually signify a rebuild is taking place? It's not like they've moved any vets. It's not like they have a young QB they're developing. I wouldn't call it a rebuild as much as I would call it finally having some common sense and realizing it starts up front. But they're still letting Watt, Heyward, Minkah, etc. expire - or do something close to it - on this roster.
As far as aging quarterbacks go, I don't know. The Packers let Favre and Rodgers go when both were evidently still very valued on the open market. Colts and Patriots let Manning and Brady walk when both were evidently still good enough to win another Super Bowl. Seattle let Russ go pretty early. I don't see too many teams trotting guys they drafted out there who can barely move.
Those teams let those guys walk when their contracts expired. Just like the Steelers did with #8.
They weren't going to pay for guys on the downsides of their careers.
Fans like HOF'ers. There's pride in seeing guys like Watt and Heyward retire wearing only one helmet. Does it help you win? Maybe maybe not? Both of those guys are still contributing at a high level.
They can fill in around them through FA signings and drafting. The only thing they can't get in that fashion is a franchise QB.