PLYMOUTH, Mich. — The presumptive No. 1 overall pick in this June’s draft sits down to talk, before a team meeting and weight training and a life of fame and fortune. He has just recovered from a midseason injury. He has nothing to gain, financially, from finishing his season. But Jack Hughes keeps playing hockey, in college arenas and small towns and next month, in Sweden for the world championships. The games are not just games to him now.