It is far too easy to second guess a coaching decision. For starters, we get to see what's behind door #1, of course it's easier after the fact to say they should have picked door #2. However, we don't know what would have been behind door #2 either, we're just assuming.
If Henry comes in and fumbles, misses a blocking assignment, or is out of position, everyone would be screaming at the top of their lungs that it was a horrible choice to put a true freshmen in that sort of position. Furthermore, we don't even know who exactly made that choice, for all we know the guy that made that choice isn't at Alabama anyway.
Sometimes second guessing is kind of obvious, there was no reward and only risk. For instance, Shula going for it (in field goal range), late in the third quarter, up big, on fourth and long. The best outcome, the best possible outcome would have been running up the score. The worst would have been a player getting hurt on a stupid, immature play. If you want to second guess a coaching call, it's those sort of things you second guess. We've all seen truly boneheaded, inexplicable coaching decisions, and there's a ton of difference between running one of the best backs in college football on fourth down vs. a truly bad coaching decision.
By the way, I disliked the post in particular because there was no question mark used. As worded, it states coaching error as a declarative statement. It's also absurd to call a guy "hot" whose breakout game came after the one in question...