I'm trying to be kind here but the idea of LeBron coming to Boston is just silly. First, the man craves personal attention, money, huge marketing venues, and a place to try to win. In that order.
In Boston he would be one amond a few on a team, so much for the personal attention.
Boston doesn't have anywhere near a max contract to offer him, so much for the money.
Boston, while a big market, isn't nearly the mecca New York is but, no matter where he goes, so goes his endorsement contracts so Boston would be okay. Lebron would never be caught dead considering OKC, Portland, Memphis, Denver, Sacramento, New Orleans, Charlotte, Minnesota, etc, etc.
Boston would be a place to win but not in the manner that would fit LeBron's desire. I'm convinced LeBron wants to win his titles the MJ way or Shaq way where he has a lesser sidekick that helps him and then a bunch of okay role models so that he can maximize his three greatest desires; personal attention, money, and marketing himself. Boston, with a KG, Rondo, Pierce and others who had already won and play within a sacrificing oneself total team concept, does not fill the bill for how he would want to win.