And I don't for a second believe Cleveland is out shopping Irving. Even if Cleveland is contemplating voiding the deal (I don't think they are), Cleveland already knows what teams were willing to pay because they had been talking to teams for a month.
This just really boils down to how Cleveland weighs the value of BKN, Crowder, Zizic, and Thomas for less time then they thought vs. the other options like Brogdon, Middleton, 1st or Bledsoe, Bender, Miami 1st or Chandler, Harris, filler or whatever other offers they received or they think they could get out of those other teams (like maybe they think they can unload Shumpert in one of those trades or get another lesser player like TJ Warren or some other useful player like say Delly back from the Bucks).
I've been saying for awhile, I just don't buy these stories and think they are purely media driven. At most Boston will give up a 2nd round pick, which both teams will do, and I'm not really sure even that will be necessary.