When he started Tom Curran didn't he bowl quite a few Yorkers against Australia back in 2017-18 , had a decent BBL the following year as well.
Maybe I am wrong or not good at this but looking at Tom Curran face with that headband and his hairstyle looks like he has been going through a mental trauma or something has a very depressing look on his face these days.
That look on face you can clearly distinguish back when he started and now.
Then
Now
Have noticed this during the recent India-England series and even evident in the lastest IPL
Well one can argue that not getting wickets can make you go from first to second pic but I have noticed this difference lately.
Again these are my views my completely be incorrect and might not have significance in his performance at all.