Re: how fake was the lamotta vs fox dive?
There were rumors and very similar big shift in betting odds prior to Billy Fox's first bout with Gus Lesnevich, too. There were a lot of rumors back then, it was nothing unusual.
What's so terrible in admitting a supposed fake some 12 or 13 years after the fight had taken place and he was retired for 6 years? He ****ing admitted being a rapist and a murderer (even though the person didn't die in the end), "admitting" a fight fixed by the mafia was nothing big compared to that.
Whenever Joey LaMotta died, he had several decades to comfirm that story. He had not, even though there was no danger, and he couldn't hurt Jake's reputation any more. Quite probably because he was a more honest person than Jake, and didn't want to confirm a lie.
Having an injury certainly explains relative lack of LaMotta's rushing/punching style a lot better than a fix. But the injury wasn't mentioned at all as a possible explanation of his actions in that fight during the 1960 investigation, it was all about mafia.