NFC North

Brad Biggs: Sean Desai, the ‘mad scientist’ of Bears defense, has a Ph.D. in education — and he knows how to communicate a lesson

CHICAGO — When former Chicago Bears cornerback Prince Amukamara congratulated Sean Desai after his promotion to defensive coordinator last month, both men had a good laugh. Desai’s big break came 11 months and one day after the Bears cut Amukamara last February. On his way out, Amukamara sent a text message to Desai, a Bears quality control assistant for six seasons before serving as the safeties coach the last two years. “I said, ‘You’re probably one of the smartest coaches I’ve ever been around. I can’t wait to see you become a DC or a head coach sometime,’ ” Amukamara recalled. “And then le…