Nah, he'd just been dropped on his head one time too many. A secondary male character to make the main male character look good, and to be the "Orko/Deputy Fuzz/etc". Here's how the roles were:
Wicket: The brave, daring male leader.
Teebo: Secondary male, bumbling, cowardly, incompetent comedy relief, mainly there to make the other characters look more competent.
Kneesaa: Love interest of main character, wholesome mother of the group
Latara: Something for daddy. Overt sex appeal and generally less empathetic attitude in a secondary female character instead of Kneesaa because lead characters must be as perfect role models as can be.