How much can Boston Celtics expect from Aaron Nesmith and Romeo Langford's development during the offseason?

Jayson Tatum's busy starring on an international stage for the Olympics while Jaylen Brown is rehabbing from wrist surgery this summer, though he's busy in his own right. The Celtics' future is bright because of their two All-Stars, both of whom are locked up in the long-term. But there are...