There are broadly two types of successful fast bowlers - attacking and attritional. Attacking bowlers use attacking lines and lengths, and consequently concede more than 3 an over, but typically manage a wicket every 7 or 8 overs (strike rate in the 40s). The attritional bowlers concede less than 3 runs an over and typically have strike rates in the 50s and averages in the early or mid 20s. As you go from left to right along the diagonal in the chart below, the cause of high economy rates shifts from a bowler being extremely attacking (Dale Steyn, Waqar Younis, Kagiso Rabada), to a bowler lacking control (Brett Lee, Shannon Gabriel and in the extreme, Fidel Edwards).
Amazing bowler
Excellent analysis. Cummins is quite similar to Anil Kumble in the sense he is always at you hardly giving any pressure release balls.
I think Pujara could have left few of the deliveries on length.