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.