"The NBA should be monitoring this situation with interest too, because the possibility of a team being encouraged by its trade partner to increase its offerings in the aftermath could be a slippery slope, setting a potentially uncomfortable precedent for future dealings."
http://www.espn.com/nba/story/_/id/20489627/nba-why-boston-celtics-sweeten-deal-amid-stalemate-cleveland-cavaliers"Ainge actually has some experience in this sort of situation, albeit not to this extent. Back during the lockout in 2011, rumors persisted that the Celtics were exploring another All-Star point guard swap, this one centered around sending Rajon Rondo to New Orleans in exchange for then-Hornet Chris Paul.
After the lockout lifted, Ainge was forced to answer questions about how the team would smooth things over with Rondo.
"Rondo will be fine. Rondo knows that we love him. He's excited to come back and play basketball, in my opinion," Ainge said that winter. "He gets a lot of attention. He's a great player."
Rondo clearly was irked by having his name invoked in trade discussions, but it didn't affect his play. Rondo produced another All-Star season after the Paul rumors and, as Boston transitioned out of the most recent Big Three era, Rondo eventually emerged as team captain in Stevens' first season at the helm.
Players know the NBA is a rather emotionless business. While hard to imagine, Thomas and Crowder could eventually embrace Boston again."