is change in bowling action affecting starc form and making him ineffective?

Starc who is considered as one of the great left hand pacers of all time was seen struggling in recent  times the main reason for his struggle is his mindset to increase his pace. 

In process of increasing  his pace he started to get injured frequently as a result to reduce  his injury concerns he remodeled his Bowling in such a way that his pace started going up and injury concerns reduced but in that process he lost his accuracy and ability to swing the ball.

If you notice you can see that the left hand he has started to stop his hand with in abs which before he used to take close to head and as a result  of shortened arm movement his Bowling arm started to become like a leverage tool which makes him get extra pace but the problem  here is since it is new for him he lost his accuracy and also the ability to swing the ball like before

this is the leverage mechanism which starc is applying. In this mechanism when an effort is put on one end the other end with load will be released with great pace

This is another device which is being used during net practice it is quite similar with starc current release point.

Before he used to jump higher at time of release which made a huge force being exerted on his ankle which leaded to several injuries so now he has reduced the height of jump to reduce force on ankle

starc Bowling comparison then and now(Touch for video comparison)