If a day or even a week pass, the Celtics aren't obligated to send KG to the Clippers and the Clippers aren't obligated to make a trade for KG. I don't see how anyone could say these trades were dependent on each other. The fact that the trade is made and there is a period of time passing is evidence that these are independent deals.
To me this just says, make deals at your own risk. If you are the Clippers and you think the Celtics are obligated to deal KG to you, don't cry when they don't.