Bookworm, that type of argument is the very stuff of legal argument and the manner in which the vast majority of arguments are cast. How effective it is in any given case really depends on how it fits into the total picture of the case being presented by the party concerned.
You are right, it is possible to construct other examples.
For fun, or if you get bored, you may like to take time out to consider an interesting point: you may conclude that the cost share provisions are, or may be, inconsistent with the PPL FI situation. However you may come to a different view entirely. It really is not straight forward at all.