McCarty signed a three year deal with Clev. in 03 for 4.1million so he should be only making 1.3 per year. Then the Suns could use the Zarko exception to pick him up.
It's almost a perfect fit financially. But McCarty is pretty popular in Boston. This is his eighth season with them, so I doubt they'd dump him just to save money.
Also, I confess I have watched him play only a little, but he sure doesn't look like much of a defender, even by Suns standards. His rebounding and block numbers are awful. Even over the past two full seasons, when he was getting 24 minutes a game, he averaged barely three rebounds and not even a third of a block.