Which of these fighters does Jack Johnson have the best chance to beat

He may have but so did Johnson when Jeffries was champion, so did Foreman when Ali was champion. Dozens of others throughout boxing history. You need to look at the big picture which you have shown not to be very interested in doing. You take the “simple” approach which is to immediately degrade the champion rather than the true culprits which are the main factors why fights are not made. Promoters, managers, public interest, potential gate, offered purses etc.

 

Here are a multitude of articles all of which are eye witness accounts of the Johnson Moran fight. Where does it say Johnson had a tough fight?

St Petersburg Times
“Johnson beat Moran easily”

SI 1959
“It was true that Johnson was not in first-rate condition, but his superlative defense held up, and he was able to evade the dreaded Mary Ann and give Moran a severe beating without the full use of his left arm.”

Le Cri de Paris: "Johnson had a cakewalk with a fighter he probably could have rid himself of in a few minutes." This paper alleged that Johnson carried Moran because he was an owner of 2/3 of the motion picture revenue and hoped to make money by making the film longer and making Moran look good for white audiences.

Le Journal: "The Negro champion of the world dominated his challenger for twenty rounds." and "Almost from the beginning of the contest it seemed as if the fight would not last ten rounds. This was a mistake because Johnson never pressed his attack and the contest lasted the limit."

Le Matin: "Jack Johnson smiled throughout the contest, smiled openly, smiled at his seconds, and laughed at Frank Moran whenever Moran would hit him in the stomach. The public was disgusted with his exhibition." The paper compared Moran to a school boy playing the role of a general who is then confronted with having to fill the generals shoes and is ill prepared for the task at hand. It intimated that while Moran was brave he appeared to lose confidence the instant Johnson entered the ring.

Le Petit Parisien: "He (Johnson) beat Moran on points easily."

L'Humanite: "By the third round Johnson had asserted his superiority over Moran." "The match was disappointing, one is left with the impression that Moran is not in Johnson's class." "Johnson clearly won on points but he is no longer the Johnson of old."

Le Figaro: This paper also said Johnson had the fight firmly in his grasp by the third round despite it being a dull monotonous affair. "Moran did not understand that at 27 years old he must take the fight to the 36 year old Johnson." By the tenth round Johnson was in such control that the author expected him to land a knockout blow at any moment. "Defeat (for Moran) was a certainty." The paper stated that Johnson was "infinitely better than Moran" and his smiling and mocking of an opponent so inferior was beneath him.

La Sport Universel Illustre: "Frank Moran, despite all of his inferiority, despite his poor quality, will now be able to avail himself of the privilege of having gone twenty rounds with Jack Johnson." "It was twenty rounds of monotony which ended in Johnson winning his victory without having to utilize his scientific knowledge of boxing."

Most accounts mention Moran bleeding constantly throughout from his nose and that a cut above his eye affected his vision.

 

After being at odds with you many times I'm pleased to see you have produced an excellent post ,backed up with primary sourced quotes. Good Job!