HE could be living the life that many fans believe retired international footballers have earned - a life of luxury, touring the world and spending holidays at high-end destinations. Instead, Musa Otieno, the most-capped Kenyan international soccer player ever and former player for South African football club Santos, is way too busy. While his role as a coach hardly looks like slowing down, he is also giving hope to vulnerable people in his home city of Nairobi. Otieno, the seventh-born in a family of eight children, was fortunate enough to sign his first professional football contract while still in high…