Remove Bangladesh and he averaged 34.26 in his so called top form...
Ah yes I was hoping someone wouldn't come up with that weak stats picking response. But I was wrong.
Roach bowled far better than that in the aforementioned period that the 34 average, even without the the BANG stats.
Case in point the 2009/10 to AUS when he broke Ponting hand while averaging 51. He clearly bowled better than that average suggests.
However if you reckon that 51 average was an accurate reflection of his series bowling efforts, which would vindicate his 34 average during his "top form" period - then we have nothing more to discuss.