Wasim, also had very little impact home and away. Wasim and Waqar, both have just 3 5-fers in win home and away combined when you look at top 6 teams during his playing days.
Impact wise, Bumrah is far ahead of Wasim as well. Wasim gets credit for skills not for impact. See below, Both Ws don't appear even in top 20 here and period is just their career. If you run this list for longer period, they won't appear in first page as well. Their impact was limited against the bottom 2 teams and minnows.
Look at Hadlee, Ambrose, Donald, Mcgrath etc... Anyone bringing that you need great team, pacers are supposed to win you test with decent team and you don't need great team. Look at Hadlee with 9 5-fers in win. No one will accuse NZ having a great team. In such a long career, after all longevity is talked for Wasim and Waqar, having just 3 5-fers in win against good teams.
I rate Wasim for skills but not for impact in test format. That's why I said earlier that if Bumrah wins 1-2 more tests in tough tours, I will put him ahead of Wasim. Remember, I am not saying about Bumrah taking 5-fers in home conditions and winning agsint WI/BD etc. I am saying if he bowls 2 more match changing spells in tough series, I will have no hesitation in rating him ahead of Wasim despite having less wickets. 350 wickets very very little impact is not better than 250 wickets with a huge impact.
Wasim at least had a balanced record with new ball/old ball skills so I have him ahead for now despite low impact.
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