Sure, there were in-between stages where the prince still thought he was a rooster but was already beginning to act like a human. So maybe the guy keeps kosher already, but is not yet observing the Sabbath completely. He's on his way, but not there yet. Not as far as I know, because each mitzvah has a value in itself. Repentance is an ongoing process, not a static state of perfect observance.
Nobody is totally observant, and nobody is totally sinful.
We all fall someplace in the middle. Israel are as full of mitzvot as a pomegranate is full of seeds. We are all still traveling on that continuum somewhere. The important thing is for our Jewish experience to be continuously growing toward an ever greater level of observance. For each Rooster Prince that I meet in the world, I try to find that point of commonality.