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AnonymousERA was significantly lower in the deadball era due to lack of homeruns. All earned runs had to be manufactured. While Mathewson, Johnson, and Young were all dominant during their time, they didn't have to contend with a guy walking and the following hitter mashing it out of the park = 2 earned runs in the blink of an eye.
Pedro Martinez,, Clemens, Randy Johnson, Maddux, Ryan, Carlton, etc would all have been extremely effective back then. To solidify my point, look at the best ERAs of the 20's-40's. You'll see that the BEST pitchers had 3.00-4.00 ERAs. I guess that tells us how really special Clemens and Pedro are.