Never understood people tagging Kuldeep as a mystery bowler. He is not at all like a Mendis or Narine who had a lot of variations. If anything Kuldeep is very orthodox in that he doesn't bowl fast and flat like many LOI spinners and loops it bowling slow and I don't think he has a good wrongun, he just has his normal stock delivery. It's perhaps his style of bowling (left arm wrist spin) is rare in world cricket and that probably contributed to the mystery part.
The reason he's struggling is that he lacks the pace to succeed in LOIs. People can just wait for it and launch it to the stands because he's too slow to trouble batsmen. When he tries to bowl fast, he loses his length. I don't think he's suited for LOIs, perhaps should concentrate on test cricket to stop his career from being very wasted.
