Schmeling would've battered him. Max Baer, Buddy, as well. Walcott would've won every round. Conn would've too. Hell, Marciano sends him to the morgue. There's about ten others who were better and would likely win. Would be more competitive though.
And we know he wasn't quite good enough to beat Carlos Takam, and that he never fought anyone as good as Billy Conn.
He was 40+ when he lost to Takam. The reason he was still around was that he was brought in to lose to guys like Price and Solis, but he ended them as serious players.
He was nearly 40 for the Wlad rematch... I don't think you realise how you've just undermined your own argument there. He was brought in because he was perceived as past his best vs fighters he should've lost to - and he beat them, proving he wasn't. And neither Price, nor Solis were ever serious players.
He was winning fights and was mandated for the rematch. They thought he was washed up after that, but he messed up some careers.
He was 41 actually and got the rematch by default when Chambers pulled out of a final eliminator. . Poor fight but there was nobody else to chose back then. Guys he beat years prior were still in contention The division was a complete wasteland