If the best yield is what one wants, it has to be Anamul Hoque for sure. Yes, trying him out in T20Is went horribly wrong but here, we are talking about tests. And yes, although he is still too young, I believe he has it in him to do far better than anybody else in the pipeline. In other words, nobody other than him and Nazimuddin comes close to contention for the number 2 spot and Anamul Hoque will definitely surpass Nazimuddin with his performance if he gets a chance.
"And be true to every promise- for, verily you will be called to account for every promise which you have made." - [Al Qur'an - 17:34]