Drafting is hard, every team has more misses than hits, but I don't think that excuses the team from using a very high pick to choose a reliever and try to make him a starter. That's a great strategy for, say, a fourth-round pick. Given how hard drafting is, wouldn't someone with a real track record have been a better choice for a top-10 pick?
Just explaining every mistake as "well, drafting is hard" ignores the possibility that even ignoring hindsight there were hundreds of players to choose from with that pick. What was special about Jay? A couple of very good seasons as a reliever, just like the career of an enormous number of failed starters.