He was double a world class bat when Hammond, Hobbs and Hutton were around. Hell, his retirement is close enough to Sobers debut that we can make a comparison there too!
It's weird to accept, as yes he could get a peach first ball and get a duck, but the reality is he tonned up every 2 matches for 2 decades. He really was that good
During that era between the great wars, at least before the WI bowlers became a threat, there were two test standard attacks. One had a top 3 ATG spinner and a great spinner and the other had the other had an assortment of good pacers who were totally ineffective on the flat Australia pitches, and on the dry English ones.
Hammond and Bradman, as much as they existed in parallel, didn't face the same test level attacks, because they had the only 2, and one was superior to the other. O'Reilly and Grimmett were so much more effective on those pitches than pacers were. Then when the WI developed a few pacers, Hammond went to the Caribbean while Hammond faces them again, at home. Hammond literally averaged 75 in Australia before the war.
Hobbs was almost as dominant as Bradman in the pre war era, which was a far more difficult batting era. And he was head and shoulders above everyone else. By the time he reached Bradman's era to which you're making the comparison, he was in his 40's and still averaging well over 50.
Hutton was I believe 23 when the war started and already had broken the world test record. He broke the world record, vs O'Reilly at 22. The conditions he faced after the war was the exact opposite of what Bradman faced. Bradman batted in the flattest if conditions during the flattest era of test cricket. Hutton after the war and while carrying an injury, played in one of the toughest. The pitches were spiced up in the 50's to at the time, unprecedented levels, and even before then he was confronted with Lindwall, Miller out the gate. He also travelled so much more than Bradman did. As close as he was to the time Bradman played, they didn't play the same game and in no human way, was Bradman twice the batsman Sir Leonard Hutton was.
Sobers debuted right after as well, but again, the pictures in the 50's (WI apart) and he faced Lindwall, Miller, Benaud, Davidson, Lillee, Trueman, Snow, Underwood, the quartet, Fazal etc etc. Not to add the insane travel and workloads he took on.
There's so much ignored context when the "Bradman was worth two batsmen" conversation comes up.
He was better, but he was not nearly twice as good as Hammond, Hutton or Sobers. Hutton opened for a England in the 50's, on those pitches.