zzz not as relevant as international stats. All 3 came in to first class cricket at a very young age but dernbach has bowled at the death nearly his whole career. He didn't really ever have a bedding in period like Woakes or Bresnan who would have been third or fourth bowlers. Also he plays at the high scoring Oval as compared to Edgbaston or Headingly. He didn't play for England U-19, his improvement has come later in the career.
You also conveniently leave out strike rate and average. you can make statistics look what you like. some need context.