More proper comparison will be taking 5-fers in wins agasint the top 5 sides in their dens. This eliminates the home criterion. Doing well and contributing in wins away against strong oppositions is true tests for bowlers. Less so for batsmen because they can't win despite piling thousands of runs, but bowlers can pick up 20 wickets to win tests.
Look at 5-fers in wins against top 5 in their den:
Steyn has 6 in entire career. McGrath has only 5 despite playing 100 plus tests. Both of them had very good team backing them and yet they had so few 5-fers in wins in these coutries. It's actually very hard to bowl match changing spells against stronger teams in their dens consistently. It's hard for even really gun bowlers like McGrath and Steyn with great teams behind them.
That's why I rate Bumrah very high. If he bowls couple of more match changing 5-fers away in these countries and takes 250 wickets, then he will among the top in history. Impact wise , he is already among the best in history despite having short career.
You will note that Marshall is in top. Yes, he has half of them in Eng, but rest came in India, Pakistan, Aus... There is a reaosn that Marshall is rated as the best test bowler in history by most fans.Just taking 5-fers in win and being ordinary in rest won't cut it. Marshall was gun in his entire career. Steyn , Mcgrath were gun in entire career. If Bumrah can do it for 3-4 more years, he will join that league.
I eliminated WI despite being top team during first half of McGrath to keep the filter simple. It's not for really comparing bowlers, but just to put my point about difficulty of consitently contributing in wins in strong opposition's den.
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