al amin is a wait and see, rubel is world class in ODIs only so far and even still he's only just bordering on world class but it's better than our others. nazmul kind of is and kind of isn't, he averages under 32 in ODIs but also only has a 4fer to show for it and no 5fers and it's important for bowlers to be able to have those occasions at times so i think that's part of the criteria for being world class i.e. being able to get 4fers and 5fers. nazmul has only played 2 tests so no point of even bringing his test career into it.
shafiul is tough as well, not good in tests , but been ok sometimes in ODIs as his average of 36 isn't atrocious though it's still not very good but he's also got 4 4fers so he does have that wicket taking ability.
BD has never had a world class test paceman, and mash is the only one to solidify that title in ODIs imo. guys like rubel, al amin, nazmul, shafiul are still maybes as if they are in the category they're right on the border and could easily fall the wrong side of it (rubel for example, he's done well in ODIs so far but i'm still not convinced he can keep it up for his entire career yet).
shahadat is BD's bowling version of ashraful and the BD version of ishant sharma (though ishant has been threatening to come good for a more prolonged period lately).
All Time Test XI: 1 Hobbs 2 B.Richards 3 Bradman 4 Pollock 5 V.Richards 6 Sobers 7 Gilchrist 8 Procter 9 Miller 10 Marshall 11 Warne