Regarding a possible Joshua Vs Paul fight, Tyson Fury announced that he will be putting $1 million bet on Jake Paul:
https://www.mirror.co.uk/sport/boxing/tyson-fury-prediction-joshua-paul-35585913I don't believe he would though, and it's likely just a sh*t talk, as there's some bad blood between him and AJ going on for years.
Eddie Hearn (AJ's manager) confirmed there are talks about making that fight happen, but I find it hard to believe that Paul would really go for it. On the other hand, losing to an active top-heavyweight would bring him no shame, unelss he gets KO'ed in an embarrassing fashion.
I don't think that he will feel humble if ever he get KO'ed the way Francis Ngannou was knockout by Anthony Joshua. We will just reason out that he lost to a bigger and heavier puncher and that he has the balls to face a active heavyweight. Although it might contradict and expose himself that he can only beat up wash up former boxers. But if it will make a lot of money for him, then why not? He has no shame as what you have said, and it's all about the money. Although I might prefer to see a match between Tyson Fury and Anthony Joshua in Wembley before any of them announced their retirement.