I know you’re poking fun at the use, but
you certainly can have a cake and eat it, but if you eat a cake you can’t therefore have it (at least not in cake form). Ironically, it was this proper use of the idiom that gave Ted K. away as the unabomber so many years ago over in Lincoln.
Apparently I’m not the only one that thinks the Duke of Norfolk was incorrect with his phrasing that became a colloquially accepted idiom. Paul Brians, Professor of English at Washington State University, points out that perhaps a more logical or easier to understand version of this saying is: “You can’t eat your cake and have it too”. Professor Brians writes that a common source of confusion about this idiom stems from the verb to have which in this case indicates that once eaten, keeping possession of the cake is no longer possible, seeing that it is in your stomach (and no longer exists as a cake). Alternatively, the two verbs can be understood to represent a sequence of actions, so one can indeed "have" one's cake and then "eat" it. Consequently, the literal meaning of the reversed idiom doesn't match the metaphorical meaning.
Regardless, maybe at Montana we can say you can’t yearn to develop a quarterback then get mad at said quarterback for not being developed whilst in the process of developing.