By being better???
Simpson practically had a 9 year career. That's way too short for a batsman really, though I respect him for coming back in after 8 years during WSC. Kapil had one of 16, for which he dragged his team mostly alone. Judging him purely on averages is like saying Weekes was better than Tendulkar for average. He had a Great home record including a few legit Great series, a Great record in West Indies and Australia. Have written previously on why his Pakistan and England numbers are bogus, but in short; had some real roads in those places. Debut series in Pakistan averaged 61 while Chandrasekhar did 48, Bedi 74 and Prasanna 125. Next series 2nd highest wicket taker and around that in averages after Imran in his 40 wickets series, MoTM in the 1st match of the next 3 match series and then last averaged 30 odd in roads again. Had a single bad game in 84 in between them. In England, was pretty good in 3 series, alright in 1 and horrible in his last. Though NZ is clearly worse here, 1 decent series and 1 horrible, with a decent single match to finish. Kapil also has 2 in the top 10 calendar years for most wickets.
Sorry, don't go along with the longevity argument. But that logic, everyone is trailing Courtney and Jimmy.
The reason no one rates Weekes above Sachin is because of the home away split and the pitches he primarily scored on and the ones he failed on.
Kapil played in what was undoubtedly a bowling era. No, not every pitch was lively, Australia, England, the Caribbean all had batting pitches and they're the same pitches that Imran, Hadlee, Lillee, Willis, Snow, Holding, Roberts, and Marshall all bowled on.
For such an era he was decidedly below par, he wasn't an ATG bowler and I struggle to call him a great one. Imran, Sobers both also had long careers, longer ones actually, with slow starts and rocky ends, their numbers don't nearly resemble his. His bowling numbers are closer to Sobers than they are to Marshall's. And can't use the Indian flat pitches reason for his average, becuse again, his average at home was better.
You say Simpson basically had a 9 (would say 10) year career that was too short, Barrington was basically the same and you rate him highly, sooooo....
Simpson was the rarest of test cricketers, a 50 averaging opening batsman and overall averaged high 40's. He opened throughout the 60's, averaging again, over 50 for the decade. Home and Away. He too when he entered the test team wasn't ready, having come into the team for his slip fielding and taking a few years to get his feet under him.
He too I wouldn't call an ATG batsman, not close, he was arguably a great one though, at worst, world class. Only 5 batsmen averaged over 50 for the decade while scoring more than 2000 runs, of them he was 4th, none of the others were openers.
In contrast in the 80's alone, an era where bowlers ruled, he still averaged 29, at under 3.5 wpm and a strike rate in the 60's. Those were Chatfield's numbers. Again, just because he was the first for India and a great for them, doesn't make him one overall.