If DeMarcus Cousins gives you a nickname, it means he likes you. He’s an incredible basketball mind.” Working with Welch in his sixth NBA season in 2015-16, Cousins averaged a career-high 26.9 points, 11.5 rebounds, 3.3 assists, 1.6 steals and 1.3 blocks. “I wouldn’t say he’s a trash-talker so much as an agitator to the point where it’s like, ‘All …