He didn't blow it up, he just finally cashed in on his assets. It took a while, he passed on George, Cousins, Butler, and others. He believes enough in Kyrie to go all-in on him, and I have to say I believe enough in Ainge at this point to think he's right.
Also, after adding Hayward and Tatum, and now Kyrie, I don't see him holding back anymore. I expect him to cash in our remaining assets very soon to win now.