There are no guarantees. Most players that are drafted don't have major injuries, and they NEVER BECOME ANYTHING special.
All that's irrelevant.
The fact is the Panthers needed immediate help at corner. Fact is Hogan had an ACL tear and from the moment he was drafted he was destined for injured reserve. Fact is he wasn't the only CB available in that draft. Fact is there were others who didn't enter the league on IR. Therefore, Hurney should've drafted a CB that didn't enter the league on IR.
How many 4th rounders start right away which is what you are suggesting?? Truth is that if we needed a corner immediately we would have taken one higher but instead took 2 DTs in the third for example. Obviously we didn't think it was the issue you do. And obviously we didn't think it was in 2012 or we wouldn't have waited until round 5. Most times fourth rounders are somewhat projects who are developed for the future. So whether you pick a guy who has talent issues or you get a guy with plenty of talent who dropped due to various issues such as injury, not a great work ethic or whatever, you know that if they start within a year or two it is a bonus. So Hogan was not a waste of a pick at this point.