Keep in mind that Aesop's Fables didn't originally come with morals! That's a strictly Victorian perversion.

The Fables were originally meant to be understood and interpreted by everyone who heard them, themselves.

(edit) I will further note that many of the "traditional" morals pasted onto some of the Fables don't actually make much sense when looked at critically. Does "slow and steady wins the race" make sense in itself, much less as an explanation for "The Tortoise and the Hare"?

A much more plausible moral would be "talent is good, but hard work is better".