Question: Who was selected fourth overall by the Toronto Raptors in a draft class that included multiple future NBA superstars such as LeBron James, Dwyane Wade and Carmelo Anthony, and had a season begin  after a much anticipated off-season as the All-Star  became a free agent in the 16th season of the Toronto Raptors?
Sentence (from "2010–11 Toronto Raptors season"): The season began after a much anticipated off-season as All-Star Chris Bosh became a free agent.
Relevant evidence: Yes