Contrary to popular belief, Sam has plenty of talent. Somehow, though, Herman coached some things OUT OF HIM that he learned in HS and took to Texas.
Sam's freshman year, if it was 2nd and 5 from the 17 and a pass was called but the WR was covered, Sam would throw it OOB or in a place where only the WR could get to it. Somehow Turtle Tom convinced him to hang on the the ball longer and keep looking in the hopes that a WR would suddenly get open.
That led to a multitude of sacks. Sam had a way of overcoming all that nonsense, but everyone knows that once you get in the red zone you have 2, maybe 3 seconds to throw it...AT MOST. Don't just hang on and get sacked.
Sam will get back to what he KNOWS works and he will do fine in the NFL. He needs to get better at that long ball, though. But at UT we never had receivers with any separation. It's a wonder he ever completed a throw at all. In the NFL, he will find that WR actually get separation or they don't play NFL.