Should Jeffries crouch or go upright against these greats?

Who should Jeffries use a crouch against, and who should he fight from a more upright posture? (Assume fighters mentioned are born into Jeffries time, develop in analogy to how they developed in their own times, peak in 1905, and that Jeffries is willing to fight any of them in a 20-round bout).

John L Sullivan
Peter Jackson
Jack Johnson
Sam Langford
Jack Dempsey
Gene Tunney
Joe Louis
Ezzard Charles
Rocky Marciano
Sonny Liston
Muhammad Ali
Joe Frazier
George Foreman
Larry Holmes
Mike Tyson
Evander Holyfield
Lennox Lewis

Feel free to suggest other boxers.

 

John L Sullivan -- crouch
Peter Jackson -- upright
Jack Johnson -- upright, but I'm interested in counter-arguments
Sam Langford -- crouch
Jack Dempsey -- crouch, maybe upright if fight goes to late rounds
Gene Tunney -- upright
Joe Louis -- crouch
Ezzard Charles -- upright
Rocky Marciano -- crouch
Sonny Liston --

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Muhammad Ali -- upright
Joe Frazier -- crouch
George Foreman --

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Larry Holmes -- upright
Mike Tyson -- probably crouch, am interested in counter-arguments
Evander Holyfield -- probably upright
Lennox Lewis -- upright

 

The crouch tends to slow Jeffries, and is associated with a MO of waiting out his opponent and countering. Stand up Jeffries tended to be faster and more agressive, though perhaps catching more in the face than if he had crouched. The crouch probably made his body a bit harder to reach -- however, in his crouching years, he tended to go very light, to compensate for the slowning effect of the crouch; he didn't worry so much about his weight in the later, more upright years, and if going upright made his body a little more available, not going so light probably made him more resilliant to body blows.

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For this thread, we're looking at a 1905 Jeffries -- he's not weight obsessed, he's generally more skillful and aggressive than the 1899/1900 Jeffries; he's faster because he's more upright; one question is, if 1905 Jeffries did crouch, will he be slower than crouching 1900 Jeffries because of increased weight?; or will improvement in his foot work compensate for the greater weight?

 

Janitor, thank you for your thoughts.

I'll try to respond this week end.