My money is on David Lee. Stevens was new here and Stevens gave Lee a chance, he sucked and disappeared. Lee was pretty bitter about his time here.
To be fair, Lee went on to play pretty effectively for both DAL and SAS after leaving BOS. He felt like he could still play effectively and that was proven by how he performed on the two Texas teams. So it's understandable that he was probably frustrated and felt like he was not really given a chance by Stevens.
On the flip side, Stevens was also clearly put in charge of a young team with goal number one being development, not necessarily optimizing the use of a 32-year-old veteran. So the fact he didn't use Lee could simply be a matter of fit.
But flipping back over, this is where communication is important, so that a guy like Lee understands and accepts why he doesn't fit.
All that said -- it is pure speculation that the player quoted was Lee. It could really be any of a number of guys.