Jurel was always in contention, he has a pretty good FC ststs. He was chosen after KL, KS Bharat, Pant, Kishan were all ruled out. Jaiswal has a god like FC stats and a left hander at the top, a gold in Indian cricket.
Abhimanyu was hard done but he is competing with Rohit. Lot of good players miss out, remember amol majumdhar? There was no IPL then. A good left hander will always win over a good right hander, especially at the top.
Parag had a wonderful FC season and he is breaking out there and he is an all round player and he is not yet playing tests. But if he breaks into india team it is well deserved as not only is a capable batsman but a decent bowler, something we completely lack in top six. And he has not been selected just speculation on your part. Sarfaraz always had issues with short pitch bowling. I don't know if you follow FC or not it was widely known. None of the top fast bowlers in india play FC to exploit it. Wait for Australia series you will know why he was withheld and management didn't have confidence. even in his case your theory doesn't hold water as he is a nobody in IPL. His selection, may be a bit late, was entirely due to FC stats and nothing to do with IPL
None of the players you mentioned are in ODI/Test teams due to their IPL performances. Infact none are in ODI team and two who are in test team are very well deserved selection based on potential, FC performance, age and the role and absolutely nothing to do with IPL.