Harvin says, “When it’s time to explode I will”

The Seattle Seahawks have amassed a 6-1 record without the centerpiece of their offseason acquisition efforts.  Now, receiver Percy Harvin has returned to practice.  He could play as soon as Monday. “It’s been a long ride,” Harvin told reporters on Tuesday.  ”I haven’t played football since Week Seven of last season, and just dealing with…