Why do you rate them so highly?
I think even quite moderate left-handers - Andrew Strauss, Justin Langer, Mark Richardson, Mark Greatbatch - can have good Test careers because they can't easily be dismissed LBW by right-arm bowlers (who pitch pretty much everything outside leg-stump).
So Aamer Sohail was pretty successful despite being average in technique, because he was mentally tough.
The only left-handers who can't succeed in Tests are the ones who don't know where their off-stump is (Shan Masood) and the ones who can't play bouncers (Fakhar Zaman).
Imam-ul-Haq has a good technique. I think he will end his career with a Test average of 45 and equally importantly a mean number of balls faced per innings of 100.
But Sami Aslam is a great prospect too, because he doesn't sell his wicket cheaply outside off-stump. He will probably only end up averaging about 40, but will probably last an average of 120 balls per innings.
That stick-ability is really important: an opener who lasts an average of 120 balls stays in until the ball is 40 overs old, and makes batting easier for the middle order.
Babar Azam is the best of the lot. Technically he is fine, but he's not especially smart so he only learns by repeated mistakes - which is why putting him at Number 3 failed. It was the same story with Steve Waugh - he took 4 years of Test cricket to learn his game and score his first century. But once players like them learn how they keep getting out, they master how to avoid it.
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