From Rio de Janeiro’s infamous Cidade de Deus slum to the UFC’s highly competitive middleweight division – and in between, a seven-year stint in the Brazilian army. For “The Ultimate Fighter: Brazil 2” alumnus Thiago “Marreta” Santos, it has always been about focus. At 32, living his best professional moment to date, he is as determined as ever to stay on the path he carefully crafted for himself. “I’ve had many dreams that I’ve been able to accomplish,” Santos, who returns Saturday at UFC 198, told MMAjunkie. “I wanted to become a paratrooper, and I did. I wanted to become a professional MMA fighter, and I did