Conversation so far:
What was Y. A. Tittle's profile and playing style?
Y. A. Tittle threw the ball from a sidearm, almost underhand position.
Was Y.A. Tittle the only person to throw the ball from a sidearm?
Y. A. Tittle threw the ball from a sidearm, something novel at those times, though it was common practice in earlier decades.
Are there any other interesting aspects about Y. A. Tittle's profile and playing style?
Despite Y. A. Tittle's throwing motion, he had a very strong and accurate arm with a quick release.
Was Y. A. Tittle married?
Y. A. Tittle's wife Minnette died in 2012.

Question: what was his biggest accomplishment?
Self-contained rewrite: What was Y. A. Tittle biggest accomplishment?