Last summer, Isaiah Thomas declared the Celtics would have to “bring the Brinks truck out” if they wanted to re-sign him in free agency. This week, Thomas signed with the Nuggets for the veteran’s minimum. Even in the high-paced world of professional sports, this was an accelerated downfall. As if we needed another reminder, it shows that sentimentality has no place in pro sports. Danny Ainge’s cold-hearted decision to swap Thomas for Kyrie Irving is one of the greatest moves he’s ever made, regardless of Irving’s future. Ainge swapped a broken down 5-foot-8 point guard for an NBA champion, Olympic gold medalist and five-time All-Star. Talk about selling high. To state the obvious, Thomas never