It's wake up time now for Josh now he has been beaten, great heavyweights of the past like Joe Louis, Ali, Lennox Lewis were beaten and lost their title(s) but they always came back as a winner and won their title(s) back, I am not saying that Josh is in the same category of the ones I mentioned because in their days there were a lot of good heavyweights around but nowadays there are not.
There is only 1 heavyweight who was never beaten and that was the late, great, Rocky Marciano, 49 professional fights and 49 wins and he retired truly undefeated, he only lost one fight in his career and that was when he was an amateur so Josh can do it but if he was fighting in an era where you had the likes of the 3 above I mentioned plus the likes of Larry Holmes, 'Smoking' Joe Frazier, George Foreman, a young Mike Tyson, Henry Cooper etc he would have had to be something special in beating them.
Anyone of the names I mentioned above would have beaten any heavyweight around nowadays, heavyweight boxing has never been the same since Lennox Lewis retired I am afraid to say, boxers of the past would have 15 brutal rounds to try and come out on top, nowadays it is 12 rounds only.