1915, 1914, 1913, 1912, 1911. To put into familiar terms terms, Langford had more power than Choynski ( based on who he knocked out ), was as durable as Willard, as energetic as Hart, and more skilled than anyone Johnson had fought in these years. Judging on how shaky Johnson was in 1909, I'd give him a good chance to win in that year.
In1909 Langford drew with Sandy Ferguson and Jim Barry, he also weighed a verified 158lbs that year when he ko'd Iron Hague who floored him.I dont find his chances then realistic at all.
He might beat an out of shape unfocused Johnson if Jack showed up in the shape he was for Moran and Co.But knowing the ability of Sam ,I don't think he would.Clay Moyle, who wrote an excellent biography of Langford believes prime for prime Johnson always beats Sam,an opinion shared by John L Sullivan.
In 1909, Johnson's absolute prime, he was outboxed by primary sources vs. Jack O'brien, and hurt and floored by Ketchel. Each man was roughly 160 pounds. I think Langford's chances are better at 170, but I think Johnson's struggles with fighters at 160 prove than Langford could do it as he's better than Ketchel and O'brien. Prior to this, Johnson was Ko'd by Choysnki who was in this 170's. For years, Johnson avoided Langford once pulling out of a 1909 signed contract to fight him and turning down various offers. Johnson would have made money if he fought Langford instead of Moran. With all due respect to Clay, a swarming attacker with greater power and chin usually beats the boxer with less power. To me, Langford was the more skilled attacker on film, had an equal reach, and was very strong himself in a clinch. Langford did not lose in 1909. I suspect those draws, at least one of them was suspect. From 1909-1915, Langford's fought and beat better competition. If we look at common opponents fought while Johnson was champion, Langford is the better.