Holding your teammates accountable is important, and it appears the Boston Celtics have no issue doing so. Kyrie Irving has shined in his first season with the C’s, but the point guard’s on-court talent seemingly has been discussed as much as his theory on the third planet from the sun. While Irving wasn’t the first professional athlete to suggest that Earth is flat, the 25-year-old effectively has become post child for the debate. Though some members of the Celtics organization have at least considered that Earth might not be round, it’s clear Gordon Hayward won’t be joining this group of outside-the-box thinkers. During a recent Twitch liv... NESN.com