Who's the best player never to win an international cap? What's the prime age for a footballer?

Seven listener questions:

1. Who is the best player to have never received a cap for their respective national team?

2. What is the prime age for a soccer player? 

3. Man Utd, Man City, Chelsea, Tottenham, and Arsenal are either in the beginning of middle stages of a rebuilding/reloading period of sorts. Which teams fans should be most optimistic at the moment, and which teams fans should be most pessimistic?

4. Why is Brek Shea a punching bag on USMNT twitter? 

5. If a player gets sold from one team to another during the transfer window, does the player get any part of the transfer fee? Is the player bound by the pay and other provisions of his original contract, or does he renegotiate his contact?

6. What is the actual definition of a “farmers league”? I’ve heard it said when mentioning leagues like Ligue 1, but never was sure what it meant. 

7. Why are more free transfers not announced in January?