What does pony mean when he says i was supposed to be the deep one?

At the point when Ponyboy says the sonnet Gone With the Wind. Johnny gets on it rapidly. Horse thought he ought to have been the profound one since Johnny says something that hints a considerable measure. He says something in regards to what and how glod is and it portends that Johnny will return to it when he is going to kick the bucket.

Sorry to say i don't have the answer