I hate to disagree, Michael. But when showing someone HOW to do something it is often best for the person learning to complete the task once shown how it can be done. Christopher was not asked to give a solution, he was asked how it could be done and he offered up one way to do so. It is then up to the person utilizing that method to perfect it how they deem necessary.
Now, if he were being paid to create a finished solution then you bet it had better be exactly that, but this was not the case.