Pull the Horford offer now.
The Celtics should not be used to get a better deal elsewhere, and that is what he is doing.
Even if he goes to OKC, he'll be getting exactly the same deal he would with the Celtics.
The only bad issue for Horford following KD to OKC .....is IF OKC doesn't win a title ......pretty sure Durrant goes to GS next year anyway. So then Westbrooke wants out ASAP ......leaving Horford stranded on a rebuilding OKC. To finish his career. ......this might be less desirable given equal money and he might choose Boston.
Horford has a one year shot to win with KD .....or go to,Boston .....Houston isn't doing anything.
Bostons best shot at landing Horford ......is KD going to GS or Clippers this year. Then he might as well sign with Boston.