grecian
Cricket Web: All-Time Legend
Might be totally unfounded but I felt like Bresnan and Sidebottom had to really push their bodies to get that extra yard of pace expected of a test bowler, and maybe weren't ever going to be able to have long international careers.
Not saying it's particularly true of these two, but that is so true of so many bowlers throughout history. There's a reason, that people like Trueman. Maco and Hadlee became great by curbing the excesses of their early days, and why the likes of Tyson, Bond, Jones burnt brightly but not for long.
England were obsessed with that extra pace though at the time, so could be they flogged these two to death.